ListCorrelate vDSP equivalent for convolution of {{a,b,c},{d,e,f}} and {{g,h,i},{j,k,i},{l,m,n}}

Question

If I ListCorrelate two list of real doubles

{{a,b,c},{d,e,f}}
{{g,h,i},{j,k,l},{m,n,o}}

in Mathematica I get

{{a*g + b*h + c*i + d*j + e*k + f*l},{a*j + b*k + c*l + d*m + e*n + f*o}}

Can anyone tell me the equivalent function in Apple's vDSP for c? Thanks

I presume the second list should be `{{g,h,i},{j,k,l},{m,n,o}}`? — Eric Postpischil, May 23 '13 at 11:17

score 3 · Answer 1 · answered May 23 '13 at 11:14

The specific case you show can be performed with vDSP_desampD(B, 3, A, C, 2, 6), where A is a pointer to the start of your first list, B is a pointer to the start of the second list, and C is a pointer to space for the output. The second parameter, 3, is the number of elements in each row/sub-list in B. The fifth parameter, 2, is the number of output elements desired. The last parameter 6, is the number of elements in A.

ListCorrelate vDSP equivalent for convolution of {{a,b,c},{d,e,f}} and {{g,h,i},{j,k,i},{l,m,n}}

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