Convolving in Matlab
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This is the code.
clear all;
i = 0;
j = 0;
folder = uigetdir;
Loaddata(folder)
for i=1:4833
%Reads in rows of numbers representing waveforms into a new vector
A(i,:) = Acquisitions(i,:)-32000;
end
t = -pi:0.01:pi;
B = tripuls(t);
for j=1:4833
W(j,:) = conv2(B,A(j,:));
end
And it keeps giving me this error: ??? Undefined function or method 'conv2' for input arguments of type 'int16'.
Error in ==> readinmaqscall at 18 W(j,:) = conv2(B,A(j,:));
So basically I am trying to convolve a triangular pulse with a bunch of different waveforms I have collected and this is the best way I know of going about it. It keeps giving me an error based on the type of data in the vectors. I am unsure what format it needs to be in for convolving.
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Accepted Answer
Andrew Newell
on 7 Apr 2011
You should convert to double:
W(j,:) = conv(double(B),double(A(j,:)));
You can use conv2. As for the type, if I enter something like
conv(unit8(u),v)
for some vectors u and v, I get the message:
Warning: CONV2 on values of class UINT8 is obsolete.
Use CONV2(DOUBLE(A),DOUBLE(B)) or CONV2(SINGLE(A),SINGLE(B)) instead.
So that gives you some idea of the options.
EDIT: I don't know why conv2 doesn't accept integer types because it is a built-in function. However, if you input a double array with integer values, it will return a double array with integer values (see the article in Steve on Image Processing for an example).
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