Conv function gives unexpected error

Question

Au. 2022-4-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1694015-conv-function-gives-unexpected-error

回答： Matt J 2022-4-11

采纳的回答： Matt J

在 MATLAB Online 中打开

Hello everyone,

I am again raising the convolution topic - sorry!

I need to convolute a gaussian, a heaviside and an exponential decay function.

Just using, for example, conv(gaussian,hea,'same') gives me always the following error:

'Subscript indices must either be real positive integers or logicals.'

this is the code i am using:

t=-5:0.1:10;
gaussian=exp(-((t-0.15)/0.164).^2);
hea=(0.2*heaviside(t-0.15));
exp_decay=(exp(-((t-0.15)/0.300)));
func=conv(hea,gaussian,'same');

I found a way arround using the erf fuction, but i do not understand what is the problem... and it would be really useful to be able to use the conv function.

Thank you so much for your answer!

Audrey

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Stephen23 2022-4-11

在 MATLAB Online 中打开

Your code works without error:

t = -5:0.1:10;
gaussian = exp(-((t-0.15)/0.164).^2);
hea = (0.2*heaviside(t-0.15));
exp_decay = (exp(-((t-0.15)/0.300)));
func = conv(hea,gaussian,'same')
func = 1×151
    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0001    0.0022    0.0218    0.1084    0.2907    0.4729