Matlab - 匿名函数中的 for 循环 [英] Matlab - for loop in anonymus function

问题描述

我对 matlab 很陌生，但我知道如何同时使用 for 循环和匿名函数.现在我想把这些结合起来.

I'm quite new to matlab, but I know how to do both for loops and anonymous functions. Now I would like to combine these.

我想写:

sa = @(c) for i = 1:numel(biscs{c}), figure(i), imshow(biscs{c}{i}.Image), end;

但那是无效的，因为 matlab 似乎只想要换行符作为命令分隔符.我以清晰的方式编写的代码将是(没有函数头):

But that isn't valid, since matlab seem to want newlines as only command-seperator. My code written in a clear way would be (without function header):

for i = 1:numel(biscs{c})
    figure(i)
    imshow(biscs{c}{i}.Image)
end

我正在寻找一种解决方案，我可以像我的第一个示例一样在一行中使用匿名函数编写它.如果我能以另一种方式创建该函数，我也会很高兴，只要我不需要为 i 新建一个函数 m 文件.

I look for a solution where either I can write it with an anonymous function in a single line like my first example. I would also be happy if I could create that function another way, as long as I don't need a new function m-file for i.

推荐答案

匿名函数可以包含多个语句，但不能包含显式循环或 if 子句.多条语句在元胞数组中传递，并一个接一个地进行求值.例如，此函数将打开一个图形并绘制一些数据:

Anonymous functions can contain multiple statements, but no explicit loops or if-clauses. The multiple statements are passed in a cell array, and are evaluated one after another. For example this function will open a figure and plot some data:

fun = @(i,c){figure(i),imshow(imshow(biscs{c}{i}.Image)}

然而，这并不能解决循环的问题.幸运的是，有 ARRAYFUN.有了这个，您可以按如下方式编写循环:

This doesn't solve the problem of the loop, however. Fortunately, there is ARRAYFUN. With this, you can write your loop as follows:

sa = @(c)arrayfun(@(i){figure(i),imshow(biscs{c}{i}.Image)},...
         1:numel(biscs{c}),'uniformOutput',false)

方便的是，该函数还返回figure和imshow的输出，即各自的句柄.

Conveniently, this function also returns the outputs of figure and imshow, i.e. the respective handles.

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