Cos inverse

Hi,
I need some help with figuring out the cos inverse function in java. I can find the cos function but i can't find the cos inverse.
I have a triangle and i know all the lenghts and it's a right angled triange but i want to find out the 1 of the angles.
so i try this math equation a^2 = b^2 + c^2 - 2bc CosA which in thurn leads me to
A = COS^-1 ( a^2 - b^2 - c^2 / 2bc )
how would i implement this?
any help is appericated.. thanks a mill.

killesk wrote:
Hi,
I need some help with figuring out the cos inverse function in java. I can find the cos function but i can't find the cos inverse.
I have a triangle and i know all the lenghts and it's a right angled triange but i want to find out the 1 of the angles.
so i try this math equation a^2 = b^2 + c^2 - 2bc CosA which in thurn leads me to
A = COS^-1 ( a^2 - b^2 - c^2 / 2bc )
how would i implement this?
any help is appericated.. thanks a mill.The Math class has the function you need. Note that the inverse cosine is also known as the arc cosine.

Similar Messages

Inverse sin cos and tan

Hello,
I was trying to use the the Math class in java but the sin cos and tan functions only take radians, not degrees and there doesn't seem to be any functions for finding the the inverse sin cos or tan. Is there another class for doing this or were sun just in a funny mood when they wrote it ?

So you missed the methods "asin", "acos", "atan", "toRadians", and "toDegrees" in the API spec how?
http://java.sun.com/j2se/1.4.1/docs/api/java/lang/Math.html
http://java.sun.com/j2se/1.4.1/docs/api/java/lang/StrictMath.html
Note that the to* methods are fairly new additions to the API. Conversion between radians and degrees isn't hard anyway ... multip</B>r divide by 180/Math.PI.

Inverse Tangent Function Problems

Hi,
I am trying to use the trigonometric function "inverse tangent", but it doesn't work as I think it should. I want to change a gradient into an angle, normally on a calculator I use height divided by length, and press the tan^-1 (inverse tan) function and get the angle. For example, the inverse tangent of 1 is 45 (degrees). If I use the inverse tangent function in Labview 2010, I get a completely different result = 0.7853.. Either I am using it incorrectly or the function isn't working properly.
I've attached an example so you can reproduce the result. I also had a similar problem with sin and cos in the formula node structures.
Thanks for any help you can give,
James
Solved!
Go to Solution.
Attachments:
Inverse Tangent.vi ‏6 KB

Hi James
I haven't seen your VI. From what I know, output given by the trignometric functions in Labview is in radians. You will have to perform radian to degree conversion to get the answer as 45.
Regards
Javed

Fast Inverse Square Root

I expect no replies to this thread - because there are no
answers, but I want to raise awareness of a faculty of other
languages that is missing in Flash that would really help 3D and
games to be built in Flash.
Below is an optimisation of the Quake 3 inverse square root
hack. What does it do? Well in games and 3D we use a lot of vector
math and that involves calculating normals. To calculate a normal
you divide a vector's parameters by it's length, the length you
obtain by pythagoras theorem. But of course division is slow - if
only there was a way we could get 1.0/Math.sqrt so we could just
multiply the vector and speed it up.
Which is what the code below does in Java / Processing. It
runs at the same speed as Math.sqrt, but for not having to divide,
that's still a massive speed increase.
But we can't do this in Flash because there isn't a way to
convert a Number/float into its integer-bits representation. Please
could everyone whinge at Adobe about this and give us access to a
very powerful tool. Even the guys working on Papervision are having
trouble with this issue.

that's just an implementation of newton's method for finding
the zeros of a differentiable function. for a given x whose inverse
sq rt you want to find, the function is:
f(y) = 1/(y*y) - x;
1. you can find the positive zero of f using newton's method.
2. you only need to consider values of x between 1 and 10
because you can rewrite x = 10^^E * m, where 1<=m<10.
3. the inverseRt(x) = 10^^(-E/2) * inverseRt(m)
4. you don't have to divide E by 2. you can use bitwise shift
to the right by 1.
5. you don't have to multiply 10^^(-E/2) by inverseRt(m): you
can use a decimal shift of inverseRt(m);
6. your left to find the positive zero of f(y) = 1/(y*y) - m,
1<=m<10.
and at this point i realized what, i believe, is a much
faster way to find inverse roots: use a look-up table.
you only need a table of inverse roots for numbers m,
1<m<=10.
for a given x = 10^^E*m = 10^^(e/2) *10^^(E-e/2)*m, where e
is the largest even integer less than or equal to E (if E is
positive, e is the greatest even integer less than or equal to E,
if E is negative), you need to look-up, at most, two inverse roots,
perform one multiplication and one decimal shift:
inverseRt(x) = 10^^(-e) * inverseRt(10) *inverseRt(m), if
E-e/2 = 1 and
inverseRt(x) = 10^^(-e) * inverseRt(m), if E-e/2 = 0.

How to Create new entry, while keeping CoS and nsRoles in tact...

Hi,
Here's the short version:
How can one create a new entry/context in DS, copy the attributes from an existing entry (using JNDI) and save them in the new entry/context WITHOUT duplicating CoS or nsRole/DN info.
Long version of the question:
We are using DS 5.2 and Portal 6 (and messenger/calendar etc). We have our employees saved in DS. What I want to do is change a user's name/uid by copying the user's attributes (in JNDI) and create a New entry with the New uid, with all the other attributes the same. Then deleting the original entry.
This is what I have done...
1. Get all the employee's attributes... (abriviated)(ctx is the DirContext)
NamingEnumeration answer = ctx.search(searchBase, filter, ctls);
SearchResult sr = (SearchResult)answer.next();
Attributes attrs = sr.getAttributes();
2. Create a new employee with the same attributes (assume I use a different uid in the dn)
ctx.createSubcontext(dn, attrs);
This works...it copies all the attributes to the new entry -BUT- when you look at the LDIF file, it ADDS several more attributes to the new entry.
Example: it adds the following...
sunPortalNetletRules
sunPortalGatewayEnableSSO
sunPortalDesktopDpDocument
sunPortalDesktopDpLastModifiedUser
iplanet-am-user-auth-modules
And about 20 others...
Now if I am not mistaken, these are the CoS and roles that the DS uses and propagates down to the entry. But when I copy the attributes over, (using JNDI) I get these attributes too but I want to copy only the attributes that are unique and have DS handle the roles and CoS like it does for the original entry.
Is there a way to tell the DS to just use the CoS or roles instead of duplicating all these attributes in this individual entry??? (and do it using JNDI)
(sorry this question is sooooo long.)
Thanks!
Eric

Hello Viji,
I am extremely thank ful for the document.
Kindly help me with below points of possible
1)     if it is standard table (LFBK) , even then shall we will need to do the generate program
step in SCDO ?
2)     does it generate Z-function module ?
3)     do we need to call this function module at appropriate places to update the CDPOS and CDHDR
for changes in the standard table ?
4)     I have already created custom business object for LFBK so that Iu2019ll be able to create entry
in SWEC (fyi)
5)     how and when are the method used in the table maintenance generator called ?
6)     Page 14 point 3 says that "Add a new entry to link the Change Document Object ZPRPS_CD and
table ZPRPS so that changes are recorded when table entries change."
Does this mean that once we create SCDO and generate program, these two steps are enough
for the SWED entry to create change log in CDPOS and CDHDR ?
7)     It is understood that it is necessary that the change object in SWEC should be logged in
CDPOS and CDHDR only then the event would be created for the SWEC entry. is this correct ?
in order to create change log for the change object in CDHDR and CDPOS, is the SCDO entry
and generate program steps enough or the methods of table maintenance generator are also
required ?
thank you very much for your time
B

How can I multiply all values of a 4-element array with all of its inverse values resulting to an array having all 16 products?

I'm quite new to LabVIEW (v.8.0) and I'm trying to figure out the easiest way to have a 4-element array multiplied by its inverse values resulting in a 16-element array
Array 1 values = 1, 2, 3, 4
Array 1 inverse values = 1, 0.5, 0.33, 0.25
Resulting array = (1, 0.5, 0.33, 0.25, 2, 1, 0.66, 0.5, 3, 1.5, 1, 0.75, 4, 2, 1.32, 1)
Any advice would be appreciated. Thanks!
Solved!
Go to Solution.

Attachments:
mo.doc ‏27 KB

I want to cancel my billing cos i didnt pay anything and it wont let me download any apps free

i try download apps free but it keep say tap continue and sign in view billing information and i didnt pay anything so how i stop it happen and cancel any payment cos i think my son accdient press any thing so pls help me

You will not be able to download anything - even free apps - until you
resolve the problem with your account.
You might want to start with these 2 links:
http://www.apple.com/support/itunes/contact/
https://getsupport.apple.com/Issues.action

Nano3rdgen Copying playlist from itunes to ipod and it says it can't copy certain songs to ipod cos of file type.These problem songs all from same album, all ACC file type and all copied fine when I copied the album itself few weeks ago-help!

When copying playlist from itunes to nano3rd message comes saying 9 of songs can't be copied to ipod cos of file type. These 9 are all from same album, all ACC and all copied fine when I copied the album itselm some weeks ago. Rest of playlist was ACC too. P.S. album is a CD-R copied version-is this an issue? HELP I AM DESPAIRING!

I never laughed in all my life. Here I was, inserting the cd Dance with Me, thinking it's not going to copy the whole thing. yeah, right.
Sure, it prompted me, Do I want to replace the songs, so of course I said "no, don't replace the songs". and guess what it did. It copied the whole cd (at least I got my two songs).
I went into the itunes library, and sure enough, all the songs were there twice. So what did my intelligent brain think of? I just unchecked the doubled songs and stuck my ipod into my computer and it synched up and I got what I wanted.
Now what did I do wrong when it prompted me. I clicked on "don't replace" and it replaced them anyway.
Am I dumb? or is itunes stupid?
thanks, Melody

Color inversion from iMac to TV

Hey,
My iMac desktop is extended to a Sony EX402 40" TV screen with this:
http://www.dealextreme.com/p/mini-di...er-1080p-34025
The problem is when im watching content on the TV it will go black after a couple of min and im getting color inversion. Its also a familiar problem for the Apple TV (scroll down for screenshots):
http://www.macstories.net/news/apple...d-philips-tvs/
Anyone knows a solution for this? I tried several HDMI ports on my TV but no luck. I could try to plug a different HDMI cable in or maybe the adapter is faulty
Im getting this on my SONY tv:
Anyone familiar with this?

Did you check Sony's support pages to see if there's a firmware update available for your TV? For example this which gives you version M8.717. (That link is to Sony UK. You better find the relevant page for your region.)
If that doesn't solve it then I'd suspect the HDMI converter.
My iMac is an older model, the late 2009 21.5" model. But I have it connected to a Sony V530 with no problems using a Kanex mini DisplayPort to HDMI converter (this one). Initially I had problems with the sound. I only got mono sound, but it turned out to be a problem with the HDMI socket on the TV. After I moved the cable to another socket, I got stereo sound.

Animated gif looks inverse in Cap 3

I've done a search already at the forum and apparently if you
have more than 100 frames it will mess up. But this animated gif
has just 5 frames.
I import it as an animation, on the stage it looks perfect,
nice white background, all set to go. I then publish it and the
background appears all strange and inverse. Like i say it looks
fine on the stage , but when i publish it it messes up.
Any ideas ?
Regards

Hi Jean
I'm guessing that the palette solution offered by P_SJ
doesn't apply to FireWorks? I'm not a FireWorks user, so I'm really
not sure what that means. Other than perhaps referring to what I
know as a transparent background color.
Maybe try setting a background color to what your background
is in Captivate?
Cheers... Rick

Various questions on uplink profiles, CoS, native VLAN, downlink trunking

I will be using vPC End Host Mode with MAC-pinning. I see I can further configure MAC-Pinning. Is this required or will it automatically forward packets by just turning it on? Is it also best not to enable failover for the vnics in this configuration? See this text from the Cisco 1000V deployment Guide:
Fabric Fail-Over Mode
Within the Cisco UCS M71KR-E, M71KR-Q and M81KR adapter types, the Cisco Unified Computing System can
enable a fabric failover capability in which loss of connectivity on a path in use will cause remapping of traffic
through a redundant path within the Cisco Unified Computing System. It is recommended to allow the Cisco Nexus
1000V redundancy mechanism to provide the redundancy and not to enable fabric fail-over when creating the
network interfaces within the UCS Service Profiles. Figure 3 shows the dialog box. Make sure the Enable Failover
checkbox is not checked."
What is the 1000V redundancy?? I didn't know it has redundancy. Is it the MAC-Pinning set up in the 1000V? Is it Network State Tracking?
The 1000V has redundancy and we can even pin VLANs to whatever vNIC we want. See Cisco's Best Practices for Nexus 1000V and UCS.
Nexus1000V management VLAN. Can I use the same VLAN for this and for ESX-management and for Switch management? E.g VLan 3 for everything.
According to the below text (1000V Deployment Guide), I can have them all in the same vlan:
There are no best practices that specify whether the VSM
and the VMware ESX management interface should be on the same VLAN. If the management VLAN for
network devices is a different VLAN than that used for server management, the VSM management
interface should be on the management VLAN used for the network devices. Otherwise, the VSM and the
VMware ESX management interfaces should share the same VLAN.
I will also be using CoS and Qos to prioritize the traffic. The CoS can either be set in the 1000V (Host control Full) or per virtual adapter (Host control none) in UCS. Since I don't know how to configure CoS on the 1000V, I wonder if I can just set it in UCS (per adapter) as before when using the 1000V, ie. we have 2 choices.
Yes, you can still manage CoS using QoS on the vnics when using 1000V:
The recommended action in the Cisco Nexus 1000V Series is to assign a class of service (CoS) of 6 to the VMware service console and VMkernel flows and to honor these QoS markings on the data center switch to which the Cisco UCS 6100 Series Fabric Interconnect connects. Marking of QoS values can be performed on the Cisco Nexus 1000V Series Switch in all cases, or it can be performed on a per-VIF basis on the Cisco UCS M81KR or P81E within the Cisco Unified Computing System with or without the Cisco Nexus 1000V Series Switch.
Something else: Native VLANs
Is it important to have the same native VLAN on the UCS and the Cisco switch? And not to use the default native VLAN 1? I read somewhere that the native VLAN is used for communication between the switches and CDP amongst others. I know the native VLAN is for all untagged traffic. I see many people set the ESXi management VLAN as native also, and in the above article the native VLAN (default 1) is setup. Why? I have been advised to leave out the native VLAN.
Example:Will I be able to access a VM set with VLAN 0 (native) if the native VLAN is the same in UCS and the Cisco switch (Eg. VLAN 2)? Can I just configure a access port with the same VLAN ID as the native VLAN, i.e 2 and connect to it with a PC using the same IP network address?
And is it important to trunk this native VLAN? I see in a Netapp Flexpod config they state this: "This configuration also leverages the native VLAN on the trunk ports to discard untagged packets, by setting the native VLAN on the port channel, but not including this VLAN in the allowed VLANs on the port channel". But I don't understand it...
What about the downlinks from the FI to the chassis. Do you configure this as a port channel also in UCS? Or is this not possible with the setup described here with 1000V and MAC-pinning.
No, port channel should not be configured when MAC-pinning is configured.
[Robert] The VSM doesn't participate in STP so it will never send BPDU's. However, since VMs can act like bridges & routers these days, we advise to add two commands to your upstream VEM uplinks - PortFast and BPDUFilter. PortFast so the interface is FWD faster (since there's no STP on the VSM anyway) and BPDUFilter to ignore any received BPDU's from VMs. I prefer to ignore them then using BPDU Gaurd - which will shutdown the interface if BPDU's are received.
-Are you thinking of the upstream switch here (Nexus, Catalyst) or the N1kV uplink profile config?
Edit: 26 July 14:23. Found answers to many of my many questions...

Answers inline.
Atle Dale wrote:
Something else: Native VLANsIs it important to have the same native VLAN on the UCS and the Cisco switch? And not to use the default native VLAN 1? I read somewhere that the native VLAN is used for communication between the switches and CDP amongst others. I know the native VLAN is for all untagged traffic. I see many people set the ESXi management VLAN as native also, and in the above article the native VLAN (default 1) is setup. Why? I have been advised to leave out the native VLAN.[Robert] The native VLAN is assigned per hop. This means between the 1000v Uplinks port profile and your UCS vNIC definition, the native VLAN should be the same. If you're not using a native VLAN, the "default" VLAN will be used for control traffic communication. The native VLAN and default VLAN are not necessarily the same. Native refers to VLAN traffic without an 802.1q header and can be assigned or not. A default VLAN is mandatory. This happens to start as VLAN 1 in UCS but can be changed. The default VLAN will be used for control traffic communication. If you look at any switch (including the 1000v or Fabric Interconnects) and do a "show int trunk" from the NXOS CLI, you'll see there's always one VLAN allowed on every interface (by default VLAN 1) - This is your default VLAN.Example:Will I be able to access a VM set with VLAN 0 (native) if the native VLAN is the same in UCS and the Cisco switch (Eg. VLAN 2)? Can I just configure a access port with the same VLAN ID as the native VLAN, i.e 2 and connect to it with a PC using the same IP network address?[Robert] There's no VLAN 0. An access port doesn't use a native VLAN - as its assigned to only to a single VLAN. A trunk on the other hand carries multiple VLANs and can have a native vlan assigned. Remember your native vlan usage must be matched between each hop. Most network admins setup the native vlan to be the same throughout their network for simplicity. In your example, you wouldn't set your VM's port profile to be in VLAN 0 (doens't exist), but rather VLAN 2 as an access port. If VLAN 2 also happens to be your Native VLAN northbound of UCS, then you would configured VLAN 2 as the Native VLAN on your UCS ethernet uplinks. On switch northbound of the UCS Interconnects you'll want to ensure on the receiving trunk interface VLAN 2 is set as the native vlan also. Summary:1000v - VM vEthernet port profile set as access port VLAN 21000v - Ethernet Uplink Port profile set as trunk with Native VLAN 2UCS - vNIC in Service Profile allowing all required VLANs, and VLAN 2 set as NativeUCS - Uplink Interface(s) or Port Channel set as trunk with VLAN 2 as Native VLANUpstream Switch from UCS - Set as trunk interface with Native VLAN 2From this example, your VM will be reachable on VLAN 2 from any device - assuming you have L3/routing configured correctly also.And is it important to trunk this native VLAN? I see in a Netapp Flexpod config they state this: "This configuration also leverages the native VLAN on the trunk ports to discard untagged packets, by setting the native VLAN on the port channel, but not including this VLAN in the allowed VLANs on the port channel". But I don't understand it...[Robert] This statement recommends "not" to use a native VLAN. This is a practice by some people. Rather than using a native VLAN throughout their network, they tag everything. This doesn't change the operation or reachability of any VLAN or device - it's simply a design descision. The reason some people opt not to use a native VLAN is that almost all switches use VLAN 1 as the native by default. So if you're using the native VLAN 1 for management access to all your devices, and someone connects in (without your knowing) another switch and simply plug into it - they'd land on the same VLAN as your management devices and potentially do harm.What about the downlinks from the FI to the chassis. Do you configure this as a port channel also in UCS? Or is this not possible with the setup descrived here with 1000V and MAC-pinning.[Robert] On the first generation hardware (6100 FI and 2104 IOM) port channeling is not possible. With the latest HW (6200 and 2200) you can create port channels with all the IOM - FI server links. This is not configurable. You either tell the system to use Port Channel or Individual Links. The major bonus of using a Port Channel is losing a link doesn't impact any pinned interfaces - as it would with individual server interfaces. To fix a failed link when configured as "Individual" you must re-ack the Chassis to re-pinn the virtual interfaces to the remaining server uplinks. In regards to 1000v uplinks - the only supported port channeling method is "Mac Pinning". This is because you can't port channel physical interfaces going to separate Fabrics (one to A and one to B). Mac Pinning gets around this by using pinning so all uplinks can be utilized at the same time.--[Robert] The VSM doesn't participate in STP so it will never send BPDU's. However, since VMs can act like bridges & routers these days, we advise to add two commands to your upstream VEM uplinks - PortFast and BPDUFilter. PortFast so the interface is FWD faster (since there's no STP on the VSM anyway) and BPDUFilter to ignore any received BPDU's from VMs. I prefer to ignore them then using BPDU Gaurd - which will shutdown the interface if BPDU's are received.-Are you thinking of the upstream switch here (Nexus, Catalyst) or the N1kV uplink profile config?[Robert] The two STP commands would be used only when the VEM (ESX host) is directly connected to an upstream switch. For UCS these two commands to NOT apply.

How can i change my bank account cos last time i used my credit card now i want to use my debit card sgain

How can i change my bank account cos i used my credit card last time now i want to use my debit card again

iTunes Store: Accepted forms of payment
http://support.apple.com/kb/HT5552
Changing Account Information > http://support.apple.com/kb/HT1918
If necessary...
Contact iTunes Customer Service and request assistance
Use this Link > Apple Support iTunes Store Contact

I have a Macbook Model No A1181 2.4 GHz intel core 2 Duo with 4 Gb Ram. Should I be able to instal Final Cut Pro 3.0.2 cos I'm having problems?

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You are trying to use software that is over 10 years old. As I read it, FCP 3.0.2 required 10.1 or higher at the time, but as FCP is reliant on quicktime, which has been updated many, many times, I doubt that you will ever get it to work properly.

Recognition of COS/COGS Account if the process is A/P Reserve Invoice

hi there,
i am trying to post an A/R Reserve Invoice of non-inventoriable item because it's Advance payment to Supplier scenario. would you know on what transaction can i create to recognize the COS/COGS Account of it? i believe if my process is :
1. PO
2. A/P Invoice
3. Outgoing Payment
under A/P Invoice transaction i'll be able to select the COS/COGS Account of it under G/L Account field but in A/P Reserve Invoice, it's not working.

Hello,
It is system functionality because whenever you make Reserve invoice the JE passed only
1.Downpayment Receive Account And Party Account
2.Party Account And Bank Account .
So we are not able to Active this filed on that document.
And On A/P invoice there are number of GL affected Like
Non- Inventory(Default Expeces0 Item Account ,Tax Account,Party Account and this account we can change on invoice.
So you should explain system functionality to your client
Thanks
Manvendra Singh Niranjan

My iPod nano 5th generation is not recognized by iTunes. I did update, but still, it won't work. I don't want to uninstall the iTunes cos I don't want to lose my music and audio books. What to do? It started after I updated iTunes.

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