Plot function into subplots

Hey,

I have a function which creates a plot. Now I want to run this function multiple times and put each plot into a subplot slot.

It should be something like this:

    function[] = myplot(x,y)
    plot(x,y);
    end
    
    subplot(3,1,1) = myplot(input_x1,input_y1);
    subplot(3,1,2) = myplot(input_x2,input_y2);
    subplot(3,1,3) = myplot(input_x3,input_y3);

This doesn't seem to work, is there an easy way to do this? Maybe with an appropriate output for the function which can be used?

Or maybe with the correct plot handle?

Any help for a simple solution would be nice.

Thanks.

Answer 1

[dpb]

for i=1:3
  hAx(i)=subplot(3,1,i);
  plot(x(:,i),y(:,i));
end

presuming all x,y are same length. If they're not, then saving them as cell arrrays is an expedient way; just dereference the array with {} inside the loop

[Daniel Schmidt]

This is a neat little trick which I didn't know of, thanks.

But for me it only works with the default plot(x,y) function.

If I try it with my own plot fuction it won't do it.

[dpb]

Show how you wrote it trying to use yours...should make no difference as long as you pass the right data set...of course, you have to call the plot() function directly after creating the subplot axes so it is gca at the time. Otherwise, you have to plot into the correct axis handle.

[Daniel Schmidt]

Well, in my plot function I do not immediately call the plot function it is more like this:

function[] = myplot(x,y)
    *getdata;
    *arrange data into multiple sets (y_1...y_n)
    *manipulate and change datasets
    plot(x,y_1)
    hold on;
    plot(x,y_2)
    [...]
    plot(x,y_n)
end

for i=1:n
  hAx(i)=subplot(3,1,i);
  myplot(x(:,i),y(:,i));
end

So it plots at the end of the function.

[dpb]

Well, your function plots everything on one axes by explicitly calling plot() multiple times in a row without either creating a subplot or having access to the handles of the subplot axes already created -- so how could it possibly do anything but?

Using multiple variables named sequentially as done is a sure sign the data are not stored effectively -- makes the need to write the same code multiple times as you have inside that function and also makes it very difficult to manipulate different pieces of the data.

You really should recast your routine so that it only retrieves and plots the dataset requested each time it is called but it needs the loop index and subplot handle to do so.

In reality, this is a case where that code logic should be inside the function itself or the logic to retrieve should be inline inside the loop--the functional factorization is at the wrong level and by not having the overall x,y data in 2D X,Y arrays or cell arrays completely prevents having any effective way to address the portions of it that you want.

As long as your "*arrange data into multiple sets" returns the named variables with the metadata of which set in the variable name and as different variables you're stuck.

Answer 2

[KALYAN ACHARJYA]

Is there an easy way to do this?

function myplot(x,y)
plot(x,y);
end

Main Script: Examples. Considering all x & y have different functions and ranges

% Define all x y data
% Thease are just examples
input_x1=[1:10];
input_y1=exp(input_x1);
input_x2=[11:20];
input_y2=log(input_x2)
input_x3=[31:45];
input_y3=exp(-input_x3);
%% Plots 
subplot(3,1,1),myplot(input_x1,input_y1);
subplot(3,1,2),myplot(input_x2,input_y2);
subplot(3,1,3),myplot(input_x3,input_y3);

Result:

[Daniel Schmidt]

This doesn't seem to work for me.

If if use the default plot(x,y) function it works.

Put with my own plot function it doesn't.

My own plot function is more complex than the simple example above.

Answer 3

[Kabil]

>> x = linspace(0,1,1000);

>> y = sin(2*pi*5*x);

>> z = cos(2*pi*5*x);

>> a = y+z;

>> subplot(3,1,1),plot(x,y);

>> subplot(3,1,2),plot(x,z);

>> subplot(3,1,3),plot(x,a);

>>