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if inside of for loop

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Alejandro Estudillo
评论： Jan 2018-2-20
I don't know what is wrong with this code. The code works when I don't include the if statement. Any idea?
for i = 1:3
if rt > 100 & rt < 1000
average(i) = mean(rt(cue==i))
dev(i) = std(rt(cue==i))
end
end
  1 个评论
the cyclist
the cyclist 2018-2-19
You are leaving too much for us to guess at, which makes it difficult for us to help you.
Please describe what you mean by "doesn't work" in more detail. Does the code give an error? If so, tell us the complete error message, and which line it occurs on.
If it does not give an error, but just an unexpected result, tell us the expected and actual result.
In general, it would be better to supply code that we can actually run ourselves (e.g. by supplying the values of rt and cue.)

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采纳的回答

Jan
Jan 2018-2-19
编辑：Jan 2018-2-20
Or perhaps:
match = (rt > 100 & rt < 1000);
rtx = rt(match);
cuex = cue(match);
for i = 1:3
average(i) = mean(rtx(cuex==i))
dev(i) = std(rtx(cuex==i))
end
Note that "if rt > 100 & rt < 1000" is evaluated as:
if all(rt > 100 & rt < 1000) && ~isempty(rt)
  2 个评论
Alejandro Estudillo
Alejandro Estudillo 2018-2-20
编辑：Alejandro Estudillo 2018-2-20
I just modified some bits and works pretty well!
match = (rt > 100 & rt < 1000);
rtx = rt(match);
cuex = cue(match);
for i = 1:3
average(i) = mean(rtx(cuex==i))
dev(i) = std(rtx(cuex==i))
end
Jan
Jan 2018-2-20
@Alejandro: Yes, this way a typo. Inside the loop rtx and cuex are needed. I've fixed this in my answer.

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更多回答（1 个）

Birdman
Birdman 2018-2-19
编辑：Birdman 2018-2-19
You probably forgot subscripting of rt.
for i = 1:3
if rt(i) > 100 & rt(i) < 1000
average(i) = mean(rt(cue==i))
dev(i) = std(rt(cue==i))
end
end
  2 个评论
Alejandro Estudillo
Alejandro Estudillo 2018-2-20
I tried the following code, but it only gives me a couple of values and the first one is 0.
for i = 1:3
if rt(cue==i) > 100 & rt(cue==i) < 1000
average(i) = mean(rt(cue==i))
dev(i) = std(rt(cue==i))
end
end
Birdman
Birdman 2018-2-20
But again
rt(cue==i)
this will result in an array. You may perhaps do it before the loop and give it subscripted to for loop as
rt=rt(cue==i);
for i=1:3
if rt(i)...

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