how to make a row all zeros in a matrix based on the two random number generated???

I have 6 matrices namely A,B,C D,E,F and all matrix are of 6*3 order. A is node 1, B -node 2,C-node 3,....F-node6.

Now i have selected two random numbers from 1 to 6. Lets say the outcome is 2 and 6.(it should change for every run)

Now i have to consider node 2 and node 6 i.e B matrix and F matrix. and have to make row 2 of B matrix all zeros and row 6 of F matrix all zeros.

This making of matrix row zeros need to be changed for every run?

How to do this?? please anyone help me in giving some hints.

I

Answer 1

[Chunru]

You can arrange A..F into a 3D matrix.

X = randn(6,3, 6);
idx = randperm(6, 2)

idx = 1×2

3 2

for i=1:length(idx)
  X(idx(i), :, idx(i)) = 0;
end
X

X = 
X(:,:,1) =

    0.9829   -0.1786    1.7468
   -0.6220    1.4833    0.5872
   -0.2820   -0.3638    0.4954
   -0.2160   -2.0395    0.6518
    0.1525   -0.3734    0.3612
    0.7840   -1.6324   -1.8073


X(:,:,2) =

   -0.5503   -0.5640    0.0966
         0         0         0
    0.6500    0.4219    0.9918
    0.1616   -1.2136    0.7539
   -0.3933    0.7912    0.2208
   -0.8855   -1.1329    0.4307


X(:,:,3) =

    1.2550    0.9819   -0.4042
    1.9447   -0.6273    1.8801
         0         0         0
   -0.0131   -1.8323    1.9285
    0.4190    0.2447    0.7425
    1.7066    0.0884   -1.0616


X(:,:,4) =

    0.1916   -0.7261    0.2208
   -0.0329    0.1441   -3.6266
    0.3964    0.9971   -1.4898
   -1.4636   -1.0939   -0.9044
    0.0458    0.0027    0.4354
    1.5481    0.5562   -0.7116


X(:,:,5) =

    0.4583    1.4250   -0.1841
    1.5220    0.0359   -0.6834
   -1.9340    0.0564   -1.3511
    0.9395   -0.9484   -0.6058
   -0.5138   -0.6197   -0.2760
   -0.7884   -0.7876    1.5975


X(:,:,6) =

   -1.2872   -0.3733   -0.0480
    0.3810   -1.6373   -0.4153
   -1.9955   -0.7583    0.0861
   -0.7313   -0.4219    0.7949
    0.1781   -0.7183    0.9187
   -0.2393    0.0841   -0.8581

[chan]

Thank you. I need this code only

for i=1:length(idx)

X(idx(i), :, idx(i)) = 0;

end

It helps me in getting my desire result.