Conv function gives unexpected error

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

[Stephen23]

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

[Au.]

Hello Stefen,

very embarrassed to recognize it does...

thank you for the fast reply!

Answer 1

[Matt J]

Clear the variable called conv from your workspace

clear conv