compare Vector and matrix
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Hi. Say I have a column vector A and matrix B as A=[1.5 5.5 9.5]' and B=[ 1 2 3; 4 5 6; 7 8 9]. I would like to write a code that compares the first element of A, A(1,1)=1.5, with the first row of B and tells me the position of this number with respect to the fist row. For this example as B(1,1)<A(1,1)<B(1,2) it passes me 1, and 0 otherwise. Then for the second element A(2,1) it should passes 1 to me at B(2,2)<A(2,1)<B(2,3) and zero otherwise. Then for A(3,1) just passed me 1 at A(3,1)>B(3,3) and zero otherwise. I want the code to passes me a position test matrix as test=[0 1 0 0;0 0 1 0;0 0 0 1]. I know that I can do this with for loops but I was wondering if there is an easier way for it too. Thanks a lot!
回答（1 个）
Roger Stafford
2016-4-15
n = size(B,1);
B0 = [-Inf(n,1),B];
B1 = [B,Inf(n,1)];
A1 = repmat(A,1,size(B,2)+1);
test = double((B0<A1)&(A1<B1));
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2016-4-15
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