how can i create this matrix
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hello,
i'm new to this software and i couldn't find an explanation to this
I have a matrix that is defined like this:
A(ij) , 1<=j<=7 , 1<=i<=8
if i>j then 2j-1
if i<=j then 4j-2i
how can i write it in the software?
Thanks for your help
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Réponses (3)
Stephen23
le 30 Déc 2019
>> [I,J] = ndgrid(1:7,1:8);
>> X = I>J;
>> M = (2+2*~X).*J.*X - 2.*~X.*I - X
M =
-2 -2 -2 -2 -2 -2 -2 -2
1 -4 -4 -4 -4 -4 -4 -4
1 3 -6 -6 -6 -6 -6 -6
1 3 5 -8 -8 -8 -8 -8
1 3 5 7 -10 -10 -10 -10
1 3 5 7 9 -12 -12 -12
1 3 5 7 9 11 -14 -14
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shlomo shnur
le 30 Déc 2019
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Stephen23
le 30 Déc 2019
Your matrix dimensions are swapped: matrices are defined by rows and columns, so your original specification "A(ij) , 1<=j<=7 , 1<=i<=8" requires a 7x8 matrix, not an 8x7 matrix like in your answer.
In any case, using loops is not a particularly neat use of MATLAB.
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