MATLAB: How can I add all the 7 values of ‘a’ in the following loop

for loop

for i=1:7

a=A(1,1)*Z(1,i)

end

Best Answer

Note: Pre-allocation is important when a loop is used.

change

A(1,1)

A(i)

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MATLAB: How to sort a matrix in desceding order

[~, sortOrder] = sort(A, 2, 'descend');

MATLAB: Vectorization, avoiding loops

Assuming this:

b=[2,3,4;7 1 6];

is a typo and supposed to read:

b=[2,3,4,7,1,6];

Then you can make the new rows as a matrix of zeros, set appropriate elements = 1, then concatenate:

A = rand(9, 10)
b=[2,3,4,7,1,6];
%make the new rows as a single block
newRows = zeros(length(b), size(A, 2));
bIx = sub2ind(size(newRows), 1:length(b), b);
newRows(bIx) = 1;
%concatenate them
A = [A; newRows]

Example output:

A =
    0.5470    0.0811    0.8176    0.5502    0.2259    0.9797    0.2217    0.0292    0.5211    0.8852
    0.2963    0.9294    0.7948    0.6225    0.1707    0.4389    0.1174    0.9289    0.2316    0.9133
    0.7447    0.7757    0.6443    0.5870    0.2277    0.1111    0.2967    0.7303    0.4889    0.7962
    0.1890    0.4868    0.3786    0.2077    0.4357    0.2581    0.3188    0.4886    0.6241    0.0987
    0.6868    0.4359    0.8116    0.3012    0.3111    0.4087    0.4242    0.5785    0.6791    0.2619
    0.1835    0.4468    0.5328    0.4709    0.9234    0.5949    0.5079    0.2373    0.3955    0.3354
    0.3685    0.3063    0.3507    0.2305    0.4302    0.2622    0.0855    0.4588    0.3674    0.6797
    0.6256    0.5085    0.9390    0.8443    0.1848    0.6028    0.2625    0.9631    0.9880    0.1366
    0.7802    0.5108    0.8759    0.1948    0.9049    0.7112    0.8010    0.5468    0.0377    0.7212
A =
    0.5470    0.0811    0.8176    0.5502    0.2259    0.9797    0.2217    0.0292    0.5211    0.8852
    0.2963    0.9294    0.7948    0.6225    0.1707    0.4389    0.1174    0.9289    0.2316    0.9133
    0.7447    0.7757    0.6443    0.5870    0.2277    0.1111    0.2967    0.7303    0.4889    0.7962
    0.1890    0.4868    0.3786    0.2077    0.4357    0.2581    0.3188    0.4886    0.6241    0.0987
    0.6868    0.4359    0.8116    0.3012    0.3111    0.4087    0.4242    0.5785    0.6791    0.2619
    0.1835    0.4468    0.5328    0.4709    0.9234    0.5949    0.5079    0.2373    0.3955    0.3354
    0.3685    0.3063    0.3507    0.2305    0.4302    0.2622    0.0855    0.4588    0.3674    0.6797
    0.6256    0.5085    0.9390    0.8443    0.1848    0.6028    0.2625    0.9631    0.9880    0.1366
    0.7802    0.5108    0.8759    0.1948    0.9049    0.7112    0.8010    0.5468    0.0377    0.7212
         0    1.0000         0         0         0         0         0         0         0         0
         0         0    1.0000         0         0         0         0         0         0         0
         0         0         0    1.0000         0         0         0         0         0         0
         0         0         0         0         0         0    1.0000         0         0         0
    1.0000         0         0         0         0         0         0         0         0         0
         0         0         0         0         0    1.0000         0         0         0         0

Best Answer

Related Solutions

MATLAB: How to sort a matrix in desceding order

MATLAB: Vectorization, avoiding loops

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