Matlab匿名函数，如果其他

问题描述

在MATLAB中，我试图在一个单元格数组上执行一个函数，但是运气不佳.我想创建一个cellfun来检查str2double是否返回NaN值，然后对不是NaNs的值执行str2double.我正在尝试在其中使用带有IF Else这类语句的匿名函数，但实际上并没有取得任何进展.到目前为止，这是我想出的:

In MATLAB I am trying to do a function on a cell array, but am not having much luck. I would like to create a cellfun which checks whether str2double returns NaN values and then perform the str2double on the values which aren't NaNs. I'm trying to use an anonymous function with an IF Else sort of statement in it but not really getting anywhere. Here is what I have come up with so far:

x = cellfun(@(x)~isnan(str2double(x)),str2double(x))

但是它不起作用，有人可以帮我吗?

However it doesn't work, could anybody help me out?

推荐答案

您可以使用逻辑索引:

x = {'1', 'NaN', '2', 'NaN'}
y = str2double(x(~isnan(str2double(x))))

y =
     1     2

这会调用str2double两次，因此如果必须执行一百万次，它的运行速度可能会变慢.

This calls str2double twice, so it may run a little slow if you have to do it a million times.

如Dan所指出的，如果您想在适当的位置更改单元格数组，请使用

as pointed out by Dan, if you want to change the cell array in place, use

x{~isnan(str2double(x))} = str2double(x(~isnan(str2double(x))))

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