Math Functions

Hello,
I am struck regarding how to get standard deviation and median function in bi answers.
Could any body help that would be much appreciable.
Thank you.

Try the following:
StdDev
Returns the standard deviation for a set of values. StdDev_Samp is a synonym for StdDev.
Syntax
StdDev([ALL | DISTINCT] numExpr)
StdDev_Samp([ALL | DISTINCT] numExpr)
Where:
numExpr
Any expression that evaluates to a numerical value.
ALL
The standard deviation is calculated for all data in the set.
DISTINCT
All duplicates are ignored in the calculation.
Median
Calculates the median (middle) value of the rows satisfying the numeric expression argument. Where there are an even number of rows, the median is the mean of the two middle rows.
Syntax
Median(numExpr)
Where:
numExpr
Any expression that evaluates to a numerical value.

Similar Messages

Using advanced math functions in plugins

I have an application built in LabVIEW 8.5 that calls external VIs as PlugIns. Normally adding any subVIs of these PlugIns in the same directory as the plugin is located in (or a sub-directory of that) will enable the plugin to execute (I have several such plugins that do run properly).
The problem now however is that one of these PlugIns use a few math functions (linear fit etc.) and, although all the subVIs and dlls (including the ones from the vi.lib etc.) are located in the same directory - and the application is run on a machine that actually has the full professional LV 8.5 installed on it, it is still not executable (I've built a source distribution to get all the code it depends on out, with no exclusions). If I hit the broken run-button it says the full development system is required to resolve the issue.
The same plugin works fine in LV 7.1.1 (although then it is distributed as a top level VI in an llb with the support-VIs in it instead).
Is there still a way in LV 8.5 to distribute a plugin that uses the math functions without having to include the functions in the built application that will launch the plugin?
MTO

Hi, Mads,
My "Quick and Dirty" test shows that it should be no any problems. Just deselect "Exclude vi.lib" Vis in the Distribution, and select that dependecies should be deployed with PlugIn. See attachment, hopefully its will be helpful for you. Such distribution way produced huge llb (because not only linear fit embedded into library, but all math library), but at least it works.
best regards,
Andrey.
Attachments:
PlugInWithMathDistributionTest.zip ‏21 KB

How to invoke math functions from dbx?

Is there an easy way to invoke math functions from dbx? If I try, for example, to call sqrt I get meaningless results:
(dbx) print sqrt(4.0)
sqrt(4) = 1074790400
(dbx)
This is from code which uses sqrt, so sqrt should be accessible. Does this need some kind of cast?

It turns out that this is a bit different than it looks: dbx is indeed able to invoke functions invoked in this way correctly; dbx just fails to print a sensible return value.
I tried with the following small function:
#include <stdio.h>
int printme(double x) {
printf("This is %g\n",x);
return (int)2*x;
Compiling this without -g, linking this with some hello world program and invoking the function from dbx gives
(dbx) print ((int (*)(double))printme)(4.0)
This is 4
((int (*)(double)) printme)(4) = &(noname)(double) at 0x8
(dbx)
The line "This is 4" clearly indicates that the function has been invoked correctly. Just the printed return value is meaningless. In this case, it is even possible to construct expressions with the return value:
(dbx) print 5 + ((int (*)(double))printme)(4.0)
This is 4
5+((int (*)(double)) printme)(4) = 13
i.e. dbx "knows" the correct return value 8. This does, however, apparently not work with return values of type double (i.e. in the original sqrt-Example).
I have therefore submitted a bug report with bugs.sun.com; I will post the BugID when (and if) this has been accepted.

What advantage does HiQ provide over LabView Math Functions

I'm evaluating how HiQ can help me to solve engineering modeling problems. I have used LabView to write several DAQ programs and a few programs to numerically solve modeling and simulation problems. What advantage are there to using HiQ compared to the math functions provided in LabView.

There aren't really any advantages. There are some visualization options that are available in HiQ that would be very difficult in LabVIEW. HiQ is just another option to use, for a different type of interface and programming than is available in LabVIEW.
Best Regards,
Chris Matthews
National Instruments

Advanced math functions/libraries

Are there any more advanced math functions/libraries available for Java (other than in the normal Math class)? Right now I'm looking for something that will rapidly return all the factors of an integer, but I am likely to be interested in other features in the future as well. Thanks.

Kramis wrote:
Are there any more advanced math functions/libraries available for Java (other than in the normal Math class)? Right now I'm looking for something that will rapidly return all the factors of an integer, but I am likely to be interested in other features in the future as well. Thanks.Not in the standard classes.
You could look at the Apache Math library:
[http://commons.apache.org/math/]
perhaps it has some number theory methods.
Or you could look into a Java bridge/interface between existing computer algebra systems (CAS) like Maple, Mathcad (both commercial) or the excellent opensource alternative: Octave. All these CAS have a bridge/interface to Java.

Math functions for dates

Hello,
Have you ever used a math function for dates (MMDDYYYY) not just a number? I'm looking to send an email out based on date field. For example, if someone's contract expires on 1/1/2016, I'd like to send them out emails 30, 152, 212 and 335 days before that date. Right now, we have fields set up for those 30, 152, 212 and 335 days and would like to know if there's a math function that would automatically fill them in dynamically based on their contract exp. date.
Thanks for your help and suggestions.

rmabrey wrote:
I have the calculator working but I am having trouble figuring out thow to do a square root function, nth factorial, absolute value, and Fibonacci. java.lang.Math.sqrt()
nothing for factorial - write your own.
java.lang.Math.abs()
nothing for Fibonacci - write your own.
%

C99 math functions

Hello all yet again,
I'm trying to use the C99 math functions: nearbyint, round, exp2, cbrt, etc... But they don't seem to be defined in the CVI2013 header file.
I previously would compile them (with gcc) only if __STDC_HOSTED__ was defined, but it appears that, although it doesn't appear in the predefined options listed in the build options, this macro is now defined in CVI2013...
So if CVI is now C99 compliant, where are those functions ? And if not, how do I know if they are present or not, short of doing #ifdef _CVI_ ?
Note, the official test seems to be:
#if _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
// C99 math functions present
#endif
Solved!
Go to Solution.

gdargaud wrote:
So if CVI is now C99 compliant, where are those functions ? And if not, how do I know if they are present or not, short of doing #ifdef _CVI_ ?
Nobody said so..., see here

TestStand math functions completely explained

Is there a reference that has complete explanations to math functions used in TestStand?
Many functions have options that are not explained under help.
BenH

Hi BenH,
Just to make sure I am on the same page as you, are you referring to the Operators/Functions found in the expression browser or something within the API? Most of the math type functions within the expression browser have their operations and parameters explained within the Description box. I am not quite sure what other options you are seeing. Could you give some examples of some of the Math functions you have questions about and the options that are not defined?
Regards,
James W.
Applications Engineer
National Instruments

Specialized math functions?

Hi,
I'm quite knew here and I would like to know if there are more specialized math functions than in class Math.
For example, I would like to work with complex numbers, integrate, differentiate, cartesian to spheric (or polar) transforms and vice versa, Fourier transforms, Matrix operations like: inverse, determinant, multiplication, size of a matrix, etc...
I'm trying to rewrite in Java a program I had in Matlab so I can put it in an applet. If someone knows where I can find this information I'll be very grateful. Thanks in advance
Mauricio

JMSL is not free. Here is some packages for some of the things you said:
http://math.nist.gov/javanumerics/

Math functions with error in/out

Please refer to the attached picture. Where do you get these math functions with the error in/out? I saw these in responding to a post.
Richard
Solved!
Go to Solution.
Attachments:
them_things.jpg ‏2 KB

No wonder I've never seen it, I never use the waveform datatype. Thanks Lynn and Smerc.
Richard

Math Functions in SAP

What are the math functions in SAP?

Hi,
This is what u want may be
Mathematical Functions
ABAP contains a range of built-in functions that you can use as mathematical expressions, or as part of a mathematical expression:
[COMPUTE] <n> = <func>( <m> ).
The blanks between the parentheses and the argument <m> are obligatory. The result of calling the function <func> with the argument <m> is assigned to <n>.
Functions for all Numeric Data Types
The following built-in functions work with all three numeric data types (F, I, and P) as arguments.
Functions for all numeric data types
Function
Result
ABS
Absolute value of argument.
SIGN
Sign of argument:                      1 X > 0
                                              SIGN( X) = 0 if X = 0
                                                               -1 X < 0
CEIL
Smallest integer value not smaller than the argument.
FLOOR
Largest integer value not larger than the argument.
TRUNC
Integer part of argument.
FRAC
Fraction part of argument.
The argument of these functions does not have to be a numeric data type. If you choose another type, it is converted to a numeric type. For performance reasons, however, you should use the correct type whenever possible. The functions itself do not have a data type of their own. They do not change the numerical precision of a numerical operation.
DATA N TYPE P DECIMALS 2.
DATA M TYPE P DECIMALS 2 VALUE '-5.55'.
N = ABS( M ).   WRITE:   'ABS: ', N.
N = SIGN( M ). WRITE: / 'SIGN: ', N.
N = CEIL( M ). WRITE: / 'CEIL: ', N.
N = FLOOR( M ). WRITE: / 'FLOOR:', N.
N = TRUNC( M ). WRITE: / 'TRUNC:', N.
N = FRAC( M ). WRITE: / 'FRAC: ', N.
The output appears as follows:
ABS:              5.55
SIGN:             1.00-
CEIL:             5.00-
FLOOR:            6.00-
TRUNC:            5.00-
FRAC:             0.55-
DATA: T1(10),
T2(10) VALUE '-100'.
T1 = ABS( T2 ).
WRITE T1.
This produces the following output:
100
Two conversions are performed. First, the contents of field T2 (type C) are converted to type P. Then the system processes the ABS function using the results of the conversion. Then, during the assignment to the type C field T1, the result of the function is converted back to type C.
Floating-Point Functions
The following built-in functions work with floating point numbers (data type F) as an argument.
Functions for floating point data types
Function
Meaning
ACOS, ASIN, ATAN; COS, SIN, TAN
Trigonometric functions.
COSH, SINH, TANH
Hyperbolic functions.
EXP
Exponential function with base e (e=2.7182818285).
LOG
Natural logarithm with base e.
LOG10
Logarithm with base 10.
SQRT
Square root.
For all functions, the normal mathematical constraints apply (for example, square root is only possible for positive numbers). If you fail to observe them, a runtime error occurs.
The argument of these functions does not have to be a floating point field. If you choose another type, it is converted to type F. The functions themselves have the data type F. This can change the numerical precision of a numerical operation.
Regards

Math functions not sure how to work with them

Im trying to work out the math functions into my program, but I'm not sure where is the mistake. This is what I have now:
(a) y = ax^2 + bc + c
(b) y = a*sin(x) + b*cos(x) + cx);Especially I'm not sure how to format the sin and cos functions
Thanks !

jordan755 wrote:
Im trying to work out the math functions into my program, but I'm not sure where is the mistake. This is what I have now:
(a) y = ax^2 + bc + c
(b) y = a*sin(x) + b*cos(x) + cx);
Java != algebra.
(a) says: Take the variable called 'ax', perform a bitwise XOR on its value with the number 2, add that result to the value of the variable 'bc', add that result to the variable 'c' and put the result in variable 'y'.
(b) is trying to call sin() and cos() methods defined in the current class and add the to variable cx.
In your other thread, you had variable names 'keyboard' and 'character'. Given that, why would you expect 'bc' to mean "b times c" rather than "variable named 'bc'"? If you want multiplication, you have to use the multiply operator, ***.
If you want to call a method that's defined outside your current class, you have to use the class name or a reference to an object of that class. The methods sin and cos are defined in the Math class. I advise you to read their docs before using them.

Questions about the High Throughput Math Functions

Hello,
i am just trying to unterstand what advandages the High Troughput Math Funtions have. So i have to ask some Questions.
I always talk about beeing inside a SCTL.
1. In the Image you can see four Add Functions. One with U32 which should use more Ressouces than the one with the U16Datatype which uses mor than the U8. But does my FXP High Througput Math Function use less Ressources than the U8 Version?
2. Which of this four Add Functions will take less time for Execution?
3. If I would Add two 32bit Numbers one with the normal Add and one with the High Throughput Add. Which of the Functions will use less Resources and which will be faster?
4. How would it bee if i had a Multiplication instead? When i unterstand the concept of a Multiplication right it will be done with a DSP48E. This Logic Block is able of Multiplying a 25bit Number with a 18bit Number. So the U32 Multiply will use 2 DSP48Es and the other three Functions would use one DSP48E.
I guess the U32 Version will have the slowest Execution?
Whats about the other three will their execution speed be equal or will the Versions with smaller Datatypes be faster?
With kind regards
Westgate
Solved!
Go to Solution.

I don't see a big rush to answer this, so I'll give it a shot:
1. The HT version uses less resources, but only because it is configured with the smallest data types. You should get exactly the same results with the same data types and an Add function. The only difference with the HT version is the ability to specify an output register, and the handshaking signals that account for that delay. IF the add is implemented in a DSP48, the integrated register can result in better timing, but in practice it is usually equivalent to an Add function followed by a feedback node.
2. The actual delay through an add is proportional to the number of bits, where the critical path is the sequentially computed carry chain. So you could run the last one at the highest clock rate. The FPGA has dedicated fast carry logic, so the difference isn't too significant.
3. The first one will be VERY slightly smaller and faster, just because you're computing one extra output bit on the second one.
4. I would expect the speed to depend only on the number of DSP48s used, so the last 3 should be similar. You'd be likely to see different results in practice, though, due to routing differing numbers of bits to registers for the indicators. This assumes you're not taking advantage of any of the pipelining configuration options in the HT Multiply. Those options, and the associated handshaking signals, are really what differentiates the HT versions from the regular numeric functions. They allow you to achieve higher clock rates and throughput at the expense of latency (ie, it will take more clock cycles to produce a valid result but you can get more data through the function in a given amount of time).
Caveats: All your examples have constant inputs, so the LabVIEW compiler and/or Xilinx tools can and will optimize them to no ops. Small multiplies, multiplies with one constant input, or those just larger than 25x18 may also use some non-DSP48 logic for all or part of the implementation. Note that the HT palettes provide a DSP48E function in case you want control over exactly how a multiply and/or add gets implemented. Placing and routing can result in unexpected behaviors, so estimating timing is much more difficult than simply adding up component delays.

Need help with Math functions for text-based calculator!!!

I have the calculator working but I am having trouble figuring out thow to do a square root function, nth factorial, absolute value, and Fibonacci. Basically i got the easy part done. Also I am using the case to do the funtions but I am not sure if there are symbols on the keyboard that are commonly used for these funtions so i just made some up. I am new to java and this is only my second assignment so any help would be appreciated. Thanks
import java.util.*;
import java.math.*;
public class calculator
static Scanner console=new Scanner(System.in);
public static void main(String[]args)
double num1=0,num2=0;
double result=0;
char expression;
char operation;
String Soperation;
System.out.println("Enter ? for help or enter the operation in which to be processed");
Soperation=console.next();
operation = Soperation.charAt(0);
switch(operation)
case '+':
System.out.println("Please the first number");
num1=console.nextInt();
System.out.println("Please enter the second number");
num2=console.nextInt();
result=num1+num2;
break;
case'-':
System.out.println("Please the first number");
num1=console.nextInt();
System.out.println("Please enter the second number");
num2=console.nextInt();
result=num1-num2;
break;
case'*':
System.out.println("Please the first number");
num1=console.nextInt();
System.out.println("Please enter the second number");
num2=console.nextInt();
result=num1*num2;
break;
case'/':
System.out.println("Please the first number");
num1=console.nextInt();
System.out.println("Please enter the second number");
num2=console.nextInt();
if(num2==0)
System.out.println("Cannot Divide by Zero");
result=num1/num2;
break;
//square root
case'^':
System.out.println("Please enter a number");
break;
//fibonacci
case'#':
System.out.println("Please enter the position of the Fibonacci number");
break;
//factorial
case'!':
System.out.println("Please enter the number for factoring");
break;
          //absolute value
case'&':
System.out.println("Please enter a number");
num1=console.nextInt();
result=num1;
break;
     // help funtion
case'?':
System.out.println("Type + for addition, - for subtraction");
System.out.println("* for multipliction, / for division,^ for the square root");
System.out.println(" & for absolute value, # for fibonacci,and ! for factorial");
break;
System.out.println("The result is:"+result);
}

rmabrey wrote:
I have the calculator working but I am having trouble figuring out thow to do a square root function, nth factorial, absolute value, and Fibonacci. java.lang.Math.sqrt()
nothing for factorial - write your own.
java.lang.Math.abs()
nothing for Fibonacci - write your own.
%

Solaris 10 x86 missing math functions in libm.

I'm working with the 3/05 distribution on a 32-bit x86 box. I'm using gcc 3 and am compiling the following:
#include <stdio.h>
#include <math.h>
double x = 3.14;
int
main()
   printf("Hello.\n");
   if ( isnormal(x) )
      printf("x is normal.\n");
   else
      printf("x is abnormal.\n");
   return 0;
}An attempt at compilation yields:
maximus$ gcc -std=c99 -o missing missing.c -lm
missing.c: In function `main':
missing.c:10: warning: implicit declaration of function `__builtin_isnormal'
Undefined                       first referenced
symbol                             in file
__builtin_isnormal                  /var/tmp//ccGq9vPa.o
ld: fatal: Symbol referencing errors. No output written to missing
collect2: ld returned 1 exit statusAfter looking at this a while I found that none of the related functions, such as, isinf(), fpclassify() are available.
I'm new to Solaris 10, so I could be missing some sort of compiler flag or library flag, but this compiles fine on Mac OS as well as Linux...
Laszlo

The missing functions are implemented as macros in
/usr/include/iso/math_c99.h on Solaris 10, but the macros only work
with the Sun C compiler.
Current Solaris Express includes a GCC implementation in
addition to a Sun C implementation in <iso/math_c99.h>.
See bug 6285517:
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6285517

How to use some math functions?

Hey everyone,
In this days i building a calculator and i need to use so
Trigo functions, how can i use them? have some table
with all the math library functions?
Thanks so much for the helpers!!

To do trig in Objective-C you use the standard C trig functions.
double sin()
double cosin()
etc.

Math Functions

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