Save an arbitrary number of figures from outside a function

Question

Scott Harris 2020-11-13

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https://ww2.mathworks.cn/matlabcentral/answers/647243-save-an-arbitrary-number-of-figures-from-outside-a-function

评论： Walter Roberson 2020-11-14

I have a function that returns a figure:

function fig = makefigure()
    fig = figure()
end

This allows me to call the function from elsewhere and programatically save the figure that it makes. I'd like to be able to do a similar thing, but for an arbitrary number of figures. For example maybe something like:

function figs = makefigures(n)
    for i = 1:n
        %make a new figure here for any arbitrary number of figures, n
    end
end

The problem is, I can't figure out how to return multiple figure handles from one function without specificying an explicit number of outputs (which I don't want to do). I tried putting the handles into a structure but this didn't work either.

Any thoughts on how to do this? Object oriented solutions are welcome (if that changes anything) because all this code is wrapped up inside of a classdef.

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Answer 1

Walter Roberson 2020-11-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/647243-save-an-arbitrary-number-of-figures-from-outside-a-function#answer_544078

在 MATLAB Online 中打开

function figs = makefigures(n)
    figs = gobjects(1,n);
    for i = 1:n
        figs(n) = figure();
    end
end

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Scott Harris 2020-11-14

在 MATLAB Online 中打开

Thanks, was unware of gobjects!

quick note too, the line inside the forloop should use i to index, not n:

figs(i) = figure();

Walter Roberson 2020-11-14

gobjects() is not strictly necessary there, but it is a good idea. It is pre-allocating graphics handles, similar to initializing an array to its proper size by using zeros()

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