Error on filter() - Subscript indices must either be positive integers or logicals

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Bryan Wilson
Bryan Wilson 2017-12-14
评论： Jan 2017-12-14
I'm trying to use filter() to do a moving average on my data, but I keep getting the error "Subscript indices must either be positive integers or logicals." What's really bothering me is I get the same error when I try running the example on the filter() webpage. Here's the example. It breaks on the y=filter(b,a,x) line.
t = linspace(-pi,pi,100);
rng default %initialize random number generator
x = sin(t) + 0.25*rand(size(t));
windowSize = 5;
b = (1/windowSize)*ones(1,windowSize);
b = [1/5 1/5 1/5 1/5 1/5]
a = 1;
y = filter(b,a,x);
plot(t,x)
hold on
plot(t,y)
legend('Input Data','Filtered Data')

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采纳的回答

Jan
Jan 2017-12-14
Hi Brian, did you see Walter's comment? Most likely the symbol "filter" was overwritten by a variable. Then the builtin function is "shadowed". If this is your problem:
clear filter
and do not use the name of builtin functions for variables in general.

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