trying to do 1D convolution without using inbuilt functions.

Question

satnam singh 2016-5-2

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https://ww2.mathworks.cn/matlabcentral/answers/282102-trying-to-do-1d-convolution-without-using-inbuilt-functions

回答： Sk Group 2021-10-25

Hi, I used the following code to do 1D convolution. But getting error:>>

a=[1 2 3];
b=[4 5 6];
K= length(a)+length(b)-1
for i=1:k
    K_out(i)= 0
         for j=1:length(b)
               K_out(i)= K_out(i)+ a(i-j)*b(j)
             end
   end

The error is: Undefined function or variable 'k'.

But I already defined K.

Thanks

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Answer 1

Stephen23 2016-5-2

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https://ww2.mathworks.cn/matlabcentral/answers/282102-trying-to-do-1d-convolution-without-using-inbuilt-functions#answer_220375

编辑：Stephen23 2016-5-2

You defined a variable K, and then tried to use k.

MATLAB is case sensitive, you cannot use upper/lowercase interchangeably.

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satnam singh 2016-5-2

Thanks...but this code still not working..as while computing (i-j) goes to zero or negative the Matlab cannot access the Zero or negative index as the index value is always positive. The error is: Attempted to access a(0); index must be a positive integer or logical.

Please suggest a way out.

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