How to create Plot button for Complex vector?

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Paul Hoffrichter 2022-6-10

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https://ww2.mathworks.cn/matlabcentral/answers/1738245-how-to-create-plot-button-for-complex-vector

编辑： Paul Hoffrichter 2022-11-9

I would like to be able to highlight a complex vector in the workspace and be able to click a button to plot complex vector the way the following function works:

PTRIn = @(x) plot(1:length(x), real(x), '-b', 1:length(x), imag(x),'--g');

If I highlight a variable in the Workspace, and hit the plot button, I do not get the desired plot. (Looks like imag vs real). If I hit the stem button, I get msg: "Warning: Using only the real component of complex data."

I have releases R2020a, R2021a, R2021b, and R2022a.

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Jan 2022-6-12

Where should this button appear?

Paul Hoffrichter 2022-6-13

编辑：Paul Hoffrichter 2022-6-13

>> I just don't want to be editing my code all the time by adding this function (or even adding global functions) or eliminates the need for me to add the PTRIn(x) function to each function.

To clarify... Say I have 100 functions. None of them have the PTRIn function defined in them. If examining, say, 6 of those functions, then in order to plot the complex valued vectors, I have to add PTRIn definition temporarily in those 6 functions and remove them later. Or, I can define it in the command window. I'd rather have a way where PTRIn is always defined so I don't have to keep defining it on an ad hoc basis. Would have been nice to have a PLOT button that has PTRIn defined.

>> Where should this button appear?

Anything that would help with my stated goal is better than what I do now. So, anywhere I guess. Would be nice to have a PLOT button that plots both the real and imag parts in one figure. Barring that it would be nice to a button that defines PTRIn in the command window without my having to copy and paste from my notepad.

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Answer 1

Jan 2022-6-13

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https://ww2.mathworks.cn/matlabcentral/answers/1738245-how-to-create-plot-button-for-complex-vector#answer_984815

在 MATLAB Online 中打开

As far as I understand, all you need is to create a folder on your local disk and add it to Matlab's PATH:

addpath('D:\MyMFiles', '-end'); % Or use the PATHTOOL

Then store this file there:

function PTRIn(x)
plot(1:length(x), real(x), '-b', 1:length(x), imag(x),'--g');
end

Now you can type PTRIn(x) in the command window and in all other scripts and functions to call your function.

The functionname "PTRIn" sounds strange, but if you can remember it, everything is fine.

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Paul Hoffrichter 2022-6-20

I am only looking at the data when I have stopped in the debugger.

=============

>> Is there any way to get a button

>> Yes, this is possible, but really tricky. Note that highlighting "x" in the editor does not allow to guess, which value x has. This will work only, if you stop the code using the debugger. Then you use the debugger and the editor as a kind of GUI to display graphics.

=============

The solution you provided will be a good step forward so no need to unaccept. (I will ask another pointed question about buttons if need be.) You refer to a tricky button solution. I don't want the "anywhere" placement to be an issue as long as the button is visible after I hit a breakpoint - this is used for my own personal debugging, so nothing fancy is required. If you could provide the steps to get a button, that would be nice. I do recall watching a Loren Matlab video where she had customized buttons just above current folder text field above the editor.

=============

>> "I am always in a stopped debugger when I use the PLOT, STEM buttons, or using PTRIn function" - and this is a complicated method to use Matlab

To clarify.. I also have programs running and when they finish, I have a set of figures that I can look at. But when I need to examine a specific figure in depth for debugging, I hit a breakpoint, and start testing other values and other code manually and get corresponding figures until I figure out what changes should be made to the code. Then I run the code without breaks to see if the figures are not good. If this a wasteful "complicated method to use Matlab", then please let me know via discussion or tutorial links how I should be debugging using Matlab in a way that is less complicated.

Thank you,

Paul

Jan 2022-7-15

I'm still convinced, that trying to modify Matlab's editor GUI will not be a clean solution. Then the editor becomes a multi-purpose tool, also known as "god tool" which is a famous programming anti-pattern.

Paul Hoffrichter 2022-7-15

编辑：Paul Hoffrichter 2022-7-15

在 MATLAB Online 中打开

I am open to better approaches. Yesterday I was pleasantly surprised while stepping through the debugger. I came across something like:

Y(start + offset:stop - k)

(Y is complex vector.)

I highlighted that expression while in the debugger and typed p in the command window and got my plot. Works better than I expected.

I may try highlighting expressions like H*x + v and see if that works.

I'm not sure why this approach is bad or error prone and considered an anti pattern. Maybe if I implemented a positive pattern with your assistance, I will understand the issues better.

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Answer 2

Steven Lord 2022-7-15

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在 MATLAB Online 中打开

I am fairly certain that it is not possible for users to register their own plotting functions for inclusion in the Plots Catalog on the Plots tab of the toolstrip.

If you have defined PTRIn as its own function then you can call it in the Command Window using any data that is in scope (so if you're stopped in the debugger, any data accessible to the function that you're debugging is fair game. I'm being intentionally vague or general here when I say "accessible".) If you have a hard and fast requirement that this be accessible via a button click, could you share why you have that requirement? Is it for accessibility, is it so you can keep keyboard focus in a particular window, is it because you're hoping to run this in an environment (like a deployed application) where the Command Window is not available, or is there some other reason?

Your eval based solution makes me a bit nervous, but if you really want to be able to click on a button you could create a favorite to run that code. To simulate you selecting the text 'x' in your code and copying it to the clipboard I'm using the clipboard function. You would then use eval in conjunction with clipboard('paste') to access the variable. Note that I am not responsible if you were to highlight, for example, some text that when evaluated closes MATLAB or does other nasty things.

x = 1:10;

clipboard('copy', 'x')

plot(eval(clipboard('paste')))

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Paul Hoffrichter 2022-7-15

My requirement is for personal convenience. It doesn't matter if i select incorrectly as I will get an error message, and I will correct the selected text.

Thank you @Steven Lord for completing this question with your reference to favorites. I now have a button that runs the code. I just double click a complex variable and now I can hit the favorite button without having to go to the Command Window and entering the p commans. I see that I don't even need the p command anymore since I can just enter @Jan's code directly into the favorite button.

(Now that I know about favorites, I'm sure I'll be adding many more in time.)

Thanks again!

Paul Hoffrichter 2022-11-9

编辑：Paul Hoffrichter 2022-11-9

在 MATLAB Online 中打开

@Jan and @Steven Lord,

I just wanted to thank both of you again for your help. My "plot" and "fft-plot" favorite buttons are a great time-saver, and helps a lot when I work with co-workers. Just last week a co-worker asked for help in code that I wasn't that familiar with. As we stepped through the problem area, I was quickly able to see how the code was transforming the data by hitting the Plot and FFT-Plot favorites. Granted, I could have asked to just type in plot commands on expressions, but was so much easier to say, highlight that variable or expression and hit the Plot and then the FFT-Plot favorite button. Without it, I would say highlight the expression, copy it, paste it into the command window, and surround the expression with a Plot or FFT-plot function.

I even made a couple of enhancements:

For matrix of vectors, if special variable, 'N_', exists, then the favorite uses it for the 2nd dimension; otherwise, plot the overlapping vectors.
Added isreal test to plot accordingly.
I sometimes want to plot what is in the command window. So I highlight the variable or expression, hit CTRL/C (probably a simpler way), but, this seems to work fine:

if ~isempty( activeEditor.SelectedText )
   Str = activeEditor.SelectedText;
else
   Str = clipboard('paste');
end

Thanks again,

- Paul

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