Cannot make vertical axis of intensity graph logarithmic

Has anyone else noticed that that the vertical axis on intensity charts cannot be made logarithmic? Labview gives you the option, but doesn't do anything when you try and check the box. Property nodes don't seem to work either. Tried this in LabVIEW 2011 SP1 and 2013. Am I doing something wrong or is this just a feature that isn't avaiable? I am just wondering if its my install or something that is really an issue.
My application is to plot the power spectrum of sound on a intensity chart to show history of sound recorded by a microphone in real time. Really good to pin point source frequencies of feedback.
Amit

Hi Amit,
This is a documented problem with LabVIEW and it is currently being worked on. Here are a couple other Forums that discuss it and offer workarounds for this issue.
Log scale in an Intensity graph
Possible bug in Intensity Graph while using interpolate colors on a Log scale
Intensity Graph - Mapping Mode
As shown in the 'Possible Bug' link above, a Corrective Action Request has been filed under the number 453407 as soon as a couple of weeks ago. To fully answer your question, it is not your install or anything like that, just an issue NI knows about and will be working on for future releases.
Douglas C.
Applications Engineer
National Instruments

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Programming intensity graph cursor to move automatically

Hi Everyone!
I want to program the 2 cursors(horizontal and vertical) in the intensity graph(Bright spot.png) to move to the bright spot in the middle of the intensity graph(live video feed from a CCD camera) automatically without dragging the cursor manually to the bright spot, is it possible?
I've attached part of my block diagram which involves the graph but i'm unable to attach the whole VI because it has some hardware dll in it.(you guys can ignore the formula part of the block diagram, it's not important)
Attachments:
Bright spot.png ‏118 KB
block diagram.png ‏45 KB

Use "Array Max&Min" to find the peak coordinates, translate them to x and y values, and change your cursor position property node to write and write these values.
I am actually not sure why you have two cursors. A single cursor with a horizontal and vertical line seems sufficient.
LabVIEW Champion . Do more with less code and in less time .

Labview Intensity Graph Vertical Axis Label

When I change the font of the vertical axis label of a Labview intensity graph, the label disappears. Is this a Labview bug or is there a way to correct the problem?

Here are those screenshots... I was a little quick to submit
- JLS
PS - of course, when you're editing the free label, it doesn't have those nasty affects, and if you group the objects (see the Free Label and Grouping screenshot) it behaves (at least cosmetically) much like a native graph label
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Attachments:
Free Label and Grouping.JPG ‏81 KB
While Typing.JPG ‏66 KB
After Typing and Clicking Off the Graph.JPG ‏67 KB

How to make beautiful intensity graph/chart?

I have one question for plotting the intensity graph using labview. I have ten bins
particle data (as attached, the first row is particle size which is y and the x is time, and the z is the particle concentration). I try to plot a intensity graph, but I got a very ugly picture. I use the property node but still don't get a good one. I want to know if the data is sufficient to make a nice plot and how to make it? Thank you very much.
Attachments:
06242008-dNdlogDp-flow3.txt ‏27 KB

Thanks,altenbach. What I mean beautiful picture is something like thisnot include the top line). Anyway, could you put your vi in the post, I use labview7.1, thank you.
altenbach wrote:
jzhao wrote:
I use the property node but still don't get a good one.
I have no idea what that means! What kind of property??? What did you wire to it????
An intensity graph needs the point regularly spaced (linear or lograrithmic), while your y mapping is nonlinear. This means you need to re-interpolate for a regular xy grid.
Unfortunately, I don't know what you mean by "ugly" can you show us an example and tell us in what way it is ugly.
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Message Edited by altenbach on 06-28-2008 01:32 AM
altenbach wrote:
jzhao wrote:
I use the property node but still don't get a good one.
I have no idea what that means! What kind of property??? What did you wire to it????
An intensity graph needs the point regularly spaced (linear or lograrithmic), while your y mapping is nonlinear. This means you need to re-interpolate for a regular xy grid.
Unfortunately, I don't know what you mean by "ugly" can you show us an example and tell us in what way it is ugly.
Here's a quick attempt, remapping the y-axis to 200 equally spaced points. I don't know if you consider this ugly.
Message Edited by altenbach on 06-28-2008 01:32 AM
altenbach wrote:
jzhao wrote:
I use the property node but still don't get a good one.
I have no idea what that means! What kind of property??? What did you wire to it????
An intensity graph needs the point regularly spaced (linear or lograrithmic), while your y mapping is nonlinear. This means you need to re-interpolate for a regular xy grid.
Unfortunately, I don't know what you mean by "ugly" can you show us an example and tell us in what way it is ugly.
Here's a quick attempt, remapping the y-axis to 200 equally spaced points. I don't know if you consider this ugly.
Message Edited by altenbach on 06-28-2008 01:32 AM
Attachments:
DMA_N.jpg ‏162 KB

Conditional formatting a graph vertical axis in SSRS 2012 charts

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Hi Oliver,
According to your description, you want to use an expression to specify different color for Axis Labels based on values in a chart.
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How to make a still picture rotate around a vertical axis ?

H there,
Can I know how do I make a still picture rotate around a vertical axis ?
Thanks

Thanks MTD,
It is indeed one good trick ...
From your timeline, it seems that you applied a transition after each clip. Can I know why & what transition you applied ?
Can you please elaborate what you meant by "I changed the last keyframe in the last clip to a Smooth" ?
Thanks again ...
Cheers
Meg The Dog wrote:
Hi -
While Mr. Wolsky is absolutely correct that you need the other software to do the effect you describe correctly, I believe you can make an approximation of what you want using FCE. Whether or not it passes the smell test is up to you.
You can see a clip I made [HERE|http://www.spotsbeforeyoureyes.com/3DTurn_Example.mov]
Because when you rotate the frame 360 degrees using the Y-axis, the image always comes back to the same position - which gives you a handy place to match cut to the next implementation of the rotation at a slightly slower pace. The last rotation was smoothed to a stop by modifying the filter keyframe to "Smooth".
So (not acounting for the pad video at the head and tail of the clip, a 1 second clip, followed by a 2 second clip, followed by a 4 second clip to give me a 7 second move.
!http://www.spotsbeforeyoureyes.com/3dTurnTimeline.jpg!
I applied the filter to the first clip, and set it so that it went from -360 to 360 in Y axis rotation. I then copied that clip and used Command -V to apply the same effect to the next to clips via paste attributes, UNCHECKING the Scale Attribute Times so that the spinning would slow down as the clips lengthened.
Lastly, I changed the last keyframe in the last clip to a "Smooth" , and added head and tail trim to the entire effect so the bars would start static, spin and the end static.
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Graph vertical axis display

Minor question, but my program (LabWindows/CVI 8.1 in Windows XP) has a virtual o'scope display that displays data from an A/D card. I'm using the graph indicator, and as with a real o'scope there is a knob that moves the displayed trace left and right on the screen to get the bits that are off of the screen if the magnification is too narrow to see it all. With the graph indicator, the left Y axis, of course, stays at the 0 point on the X axis and will go off of the screen with X=0. I'd like to have a vertical axis that stays in the center of the graph at all times (like a real o'scope reticule) no matter what the actual graph is doing. Any suggestions would be greatly appreciated. (The X-Axis offset parameter doesn't do the trick).

Another possibility is to use a second graph with transparent background, no X-axis grid and labels, no Y-axis grid; place it on top of the main graph like in the attached UIR file (you will need to adapt vertical size of the second graph since it has no X-axis. labels).
(Note: I created the UIR in CVI 8.5 and saved for previous version: if you do not succeed in opening it tell me and I will repost it in TUI format for you to load).
Proud to use LW/CVI from 3.1 on.
My contributions to the Developer Zone Community
If I have helped you, why not giving me a kudos?
Attachments:
CentralYaxis.zip ‏2 KB

Issue with min/max when vertical axis assigned to multiple series

Hi.
I have some simple charting code that is dynamically adding LineSeries to a chart as the user requests them from the gui. As each series is added the vertical axis is assigned to the series and then data is requested and assigned to the dataProvider on the series. This is all working fine however I have found that if I add a sceond series after the first series is displayed and assign the same vertical axis to the second series then the vertical axis seems to set teh min/max based only on the second series added and ignores the first series. It doesnt set to the max of both series and so I get an incorrect max set. If I add a 3rd series the same happens again and the first and second series values seem to be ignored and the axis is set based on the last series to be added.
Is this expected? Ive tried different variations of invalidating the data/series/styles to force it to refresh but I always get the same. It does refresh but based on only the values in the last added series.
What is odd is that if I add 2 series at the same time, and assign the axis to both of them and then request data for both and update the dataProvider on both of them the axis is configured correctly based on the max value of both series.
Any workarounds to make it do the right thing if they are added dynamically? Is this a bug or a known "feature"?
Any light anyone can shed would be appreciated.
I need to have the axis assigned to the series directly as I want to be able to use multiple axes. I have found that if I set the verticalaxis on the chart rather than the series then it works fine and sets the min/max based on the combined values of both series.
The vertical axis is just a simple LinearAxis.
Any help or suggestions would be appreciated.
Im using Flex 4.1
Tks
Dan

Adobe Flex LiveDocs seemed to indicate "Using multiple series in the same chart works best when the data points are in a similar range (such as a stock price and its moving average). When the data points are in numerically very different ranges, the chart can be difficult to understand because the data is shown on a single axis. The solution to this problem is to use multiple axes, each with its own range. You can plot each data series on its own axis within the same chart using the techniques described in Using multiple axes" and that link is here:
http://livedocs.adobe.com/flex/3/html/help.html?content=charts_types_11.html
I was going to tae a look at this myself, but the code posted here is quite complex, and I suspect incomplete.
If you refer to that link and still cannot solve the issue, I would try your best to boil down your code to a more simple example still exhibiting the issue, and then post that, along with any data and the simplified main app.
If this post answers your question or helps, please mark it as such.
Greg Lafrance - Flex 2 and 3 ACE certified
www.ChikaraDev.com
Flex / AIR Development, Training, and Support Services

Fix axes in intensity graph with cursor

Hi all,
I try to use the intensity graph as an xy-input device. The user should be allowed to drag the cursor to enter the value. However, the user can always move the cursor outside the plot area, which causes the corresponding axis to rescale. I want to have strictly fixed upper and lower limits. Is there any way to achieve this? One possible solution would be to reset the min/max values every time the cursor was moved (and coerce the cursor position back into the range). A simpler approach would be appreciated!
Regards,
Matthias

> I try to use the intensity graph as an xy-input device. The user
> should be allowed to drag the cursor to enter the value. However, the
> user can always move the cursor outside the plot area, which causes
> the corresponding axis to rescale. I want to have strictly fixed upper
> and lower limits. Is there any way to achieve this? One possible
> solution would be to reset the min/max values every time the cursor
> was moved (and coerce the cursor position back into the range). A
> simpler approach would be appreciated!
>
You don't say what version of LV you are using, but if it is relatively
recent, right click on the graph and go to Advanced and uncheck the
option to have Cursors Scroll Graph. The user can still drag and
release the cursor und
er the edge of the graph, but this will not change
the scales. You can pretty easily filter cursor points that are out of
range and even write back to the cursor value if you need to. I believe
that if there is data in the plot and the cursor is set to lock to the
plot, then it cannot be dragged outside the data either, and that is
another solution.
Greg McKaskle

Region of Interest (ROI) on Intensity Graph

Hello,
I hope somebody can help me. I have read the other posts available regarding choosing ROIs on intensity graphs but they don't really answer my question.
I am taking a series of still images. Having stored the image as an array and displayed it on the intensity graph, I need some way of selecting a rectangular ROI (preferably with mouse) to define an array subset and performing max/min/mean/standard deviation measurements on this region. I am aware that the array would need reshaping to work with the in built VI for mean and standard deviation but cannot seem to find a way to may the selection of the array subset in the first place.
I would be very grateful for any pointers
Sarah Bohndiek

Hi,
since you're using an intensity graph, you could use an event structure to capture for the mouse down and mouse up events.
They both give you the coords of where the mouse was. The nex trick would be to convert that into array position co-ordinates, which requires knowing how the data is presented in the graph (actual graph area size, and the amount of data passed to it.) It's easy enough to get the size of the plot area, and you can get the position of the control itself, however calculating exactly where the plot area is inside of the control is not available.
If you plot area size is fixed, you could use a picture control, set to transparent over the top of the plot area. Then use the same trick for the event returning co-ordinates. If you change the values on the scale however, the actual plot area can change in size too (since the renumbering on an auto-scale can cause the scale on the axis to move if the text increases or decreases in length)
By far the easiest route would be to buy the vision development module and use the image control which has the built in ROI capabilities (and editing of the ROI).
Hope that helps
Sacha Emery
National Instruments (UK)
// it takes almost no time to rate an answer
Attachments:
roi on intensity (picture).vi ‏73 KB

Problem with Font Embed for vertical axis title

Dear Friends,
I have embedded a truetype arial font to rotate the vertical axis title, It works fine in xcelsius design mode(canvas) , but when i click preview button i coudln't see the vertical axis title.
Should i change any font settings in xcelsius? or Should i have licence to my fonts? Please help me to fix this issue.
Thanks in advance,
Manimaran.

cannot be rendered...that's odd. But becoming unrendered is standard. When you render the text on top of the video it makes one renderd file out of the two layers, If you change one of the layers, then the rendered file is no longer current and it has to make a newly rendered file with the current settings (in this case the altered text.) It's no different than if you were to change a setting on a filter, even one tiny notch, or change the duration of a transition. If you want to limit the amount of the render, cut the bottom clip at the beginning of the text clip and the end and it will only need to re-render the area overlapped by the text.

Changing color table for intensity graphs

Hi, I've been working on superimposing intensity graphs and I'm almost getting it, I'm just having trouble with color table, it is suppose to be composed of a 1-D array of 256 colors
I have 2 intensity graphs each with a different color table (256 color - 256 locations in the color table array). I need to "squeeze" both color table into a third color table for the superimposing of the 2 intensity graphs. therefore I figure I would take every other color value from each of the first 2 color tables (so each color table shrinks to 128 color) and add the values to form a 3rd color table so that the bottom will correspond to the first color table and the top will correspond to the 2nd color table.
I can do this manually, but it takes WAY too long, so I've been trying to use some kinda of algorism, but I cannot succeed. Anyone have any suggestions? it seems that color table is an unusual kinda of array
My attempted program is attached.
thanks very much!!
Attachments:
superimposing3.vi ‏111 KB

Brian,
I think this is what you're after (attached). The easiest thing to do is to decimate, then concatenate your original color tables to form your new "squeezed" color table. However, keep in mind that you also have to squeeze, or remap, your underlying data values to correspond with either one half of the color table or the other.
See if what I did makes sense.
Regards,
John
Attachments:
superimposing3_MOD.vi ‏90 KB

Using intensity graph

Hi,
Currently, I have some problem using the intensity graphs. I am using the Time frequency toolbox in Labview. Currently, I am having a problem where I needed to plot the spectrogram of the signal. I have tried to maintain a plot of spectrogram at 0 to 4s and another at 4s to 8s. I am trying hard to plot two graph together, to form a plot of 0s to 8s, in the spectrogram. Furthermore, the time axis will continue to increases at 4s interval with updated spectrogram. I wonder how could i achieved in having two spectrogram with two different time interval to display a common plot? Thanks a lot for advice.
Rdgs
kengkc
Solved!
Go to Solution.

Hi kengkc,
Correct me if I am wrong, but are you saying that you have the data for the first 4 seconds of your acquisition (t = 0 to 4) and the next 4 seconds of your acquisition (t = 4 to 8) and you want to combine them into one plot? I presume since you were able to plot them in an intensity graph to begin with, that they are already in arrays.
If that is what you want to do, you can easily concatenate your arrays using the Build Array function (this means to append one array to the end of another). Add your Build Array function from the Array subpalette, and make sure you right click it and choose Concatenate Arrays so that you dont get more dimensions in your resultant array. Then expand the Build Array function so that you can wire your arrays into it.
Please refer to the attached screenshot for an idea of what I mean.
Hope this helps.
Best regards,
Vern Yew
Applications Engineer
Attachments:
concatenate.JPG ‏17 KB

Fade colors of intensity graph

Hi everyone,
I've made a program where I read an 2D-array and plot this array in a intensity graph.
I was wondering if the colors in the graph can fade in each other, preferably in vertical position (columns). The idea is that the numeric data becomes visualized like a DNA profile.
I've added a image of the plotted graph.
Thanks.
Solved!
Go to Solution.
Attachments:
Intensity graph plot major.PNG ‏48 KB
Intensity graph plot minor.PNG ‏35 KB

Without manipulating the array, no it's not possible. I made an idea on the Idea exchange to fix this, I recommend you vote for it. Anti-Alias or Smooth Intensity Plot
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Tim Elsey
LabVIEW 2010, 2012
Certified LabVIEW Architect

How to display no. of seconds in HH:MM:SS format on Y-Axis in Line Graph

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I have two columns as No. of Seconds and Date.
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Srini VEERAVALLI I already used this code and I'm getting HH:MM:SS format in Table View, but my requirement is I need to represent the HH:MM:SS format on Vertical Axis in Graph View. In Graph View by default it's considering No. of Seconds only.....
Srini VEERAVALLI, is your full name is Srinivas Veeravalli ?

Cannot make vertical axis of intensity graph logarithmic

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