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

问题描述

我对Matlab还是很陌生，但是我知道如何同时执行循环和匿名函数.现在，我想将这些结合起来.

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;

但这是无效的，因为matlab似乎只希望将换行符用作命令分隔符.我的代码写得很清楚(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，可以像我的第一个示例那样在单行中使用匿名函数编写它.如果我可以用其他方式创建该函数，也很高兴，只要我不需要为i创建新的函数m文件即可.

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，但没有显式循环或if-子句.多个语句在单元格数组中传递，并一个接一个地求值.例如，此功能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)}

但是，这不能解决循环问题.幸运的是，有 ARRAYFUN .这样，您可以编写循环，如下所示:

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)

方便地，此函数还返回figure和imshow的输出，即相应的句柄.

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

这篇关于Matlab-匿名函数中的for循环的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！