Array indices must be positive integers or logical values.

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matlabgod
matlabgod 2018-9-27
评论： Star Strider 2018-9-27
I'm trying to create a loop that plots the function for each t value on the same graph, I am getting an "Array indices must be positive integers or logical values." error.
t = [1 24 48 72];
x = linspace(0,1,4);
for ii = length(t)
u=1.656e-5;
c(x)=(0.5).*erfc(x./(2.*sqrt(u.*t)));
plot (x, c)
end

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回答（1 个）

Star Strider
Star Strider 2018-9-27
This will run:
t = [1 24 48 72];
x = linspace(0,1,4);
for ii = length(t)
u=1.656e-5;
c(ii)=(0.5).*erfc(x(ii)./(2.*sqrt(u.*t(ii))));
plot (x, c)
end
although you may want to experiment with it.
Note that I subscripted ‘x’ and ‘t’, since I assume that is what you intend.
  2 个评论
matlabgod
matlabgod 2018-9-27
Hi thanks for the quick response, but now I'm getting "Error using plot Vectors must be the same length." error.
Star Strider
Star Strider 2018-9-27
My pleasure.
You must be using different size vectors for ‘t’ and ‘x’.
My code works with the code you posted.

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