What is "peaks" in tutorialApp?

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Ken
Ken 2023-12-24
评论: Voss 2024-4-4
I am learning Matlab graphical user interface tools. I find that tutorialApp.mlapp seems to be a readily available thing, embedded in Matlab itself. I have successfully run it. Now, looking at the code, I would like to understand it better and play with it some. These lines (16-18) seem to be doing the hard work of building the graph:
value = app.AmplitudeSlider.Value;
plot(app.UIAxes, value*peaks)
app.UIAxes.YLim = [-1000 1000];
Okay, so it would appear that the data must be contained in this object called peaks. But I can't find that object defined anywhere. Where is it, and what is its type? Or if I'm wrong, where is the data, really?
  1 个评论
Dyuman Joshi
Dyuman Joshi 2023-12-24
"Where is it, and what is its type? Or if I'm wrong, where is the data, really?"
As Voss has mentioned, it is a built-in function, i.e. it comes with MATLAB.
You can use the MATLAB Documentation to search for such functions, either online or on your MATLAB app using help like this -
help peaks
PEAKS A sample function of two variables. PEAKS is a function of two variables, obtained by translating and scaling Gaussian distributions, which is useful for demonstrating MESH, SURF, PCOLOR, CONTOUR, etc. There are several variants of the calling sequence: Z = PEAKS; Z = PEAKS(N); Z = PEAKS(V); Z = PEAKS(X,Y); PEAKS; PEAKS(N); PEAKS(V); PEAKS(X,Y); [X,Y,Z] = PEAKS; [X,Y,Z] = PEAKS(N); [X,Y,Z] = PEAKS(V); The first variant produces a 49-by-49 matrix. The second variant produces an N-by-N matrix. The third variant produces an N-by-N matrix where N = length(V). The fourth variant evaluates the function at the given X and Y, which must be the same size. The resulting Z is also that size. The next four variants, with no output arguments, do a SURF plot of the result. The last three variants also produce two matrices, X and Y, for use in commands such as PCOLOR(X,Y,Z) or SURF(X,Y,Z,DEL2(Z)). If not given as input, the underlying matrices X and Y are [X,Y] = MESHGRID(V,V) where V is a given vector, or V is a vector of length N with elements equally spaced from -3 to 3. If no input argument is given, the default N is 49. Documentation for peaks doc peaks

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回答(2 个)

Voss
Voss 2023-12-24
  1 个评论
Voss
Voss 2024-4-4
@Ken: Did this answer clarify the problem? If so, please Accept it.

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Image Analyst
Image Analyst 2023-12-24
peaks a built-in function that you can actually open up and look at in the editor. Do this at the command line:
>> edit peaks.m

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