Hi

I have some difficulties in manipulating matrices in Maple

For example, I have a matrice with 40 rows and 9 columns ans I want to extract the odd rows taking columns inchanged. The new matrice which has 20 rows and 9 columns must replace the old matrice

In Matlab, I do this with only one command: WTable=WTable(1:2:40,:);

Thanks in advance for help

Hi

Thanks for reply

sgn:=(-1)^(r-1);

Thank you for the answers

It is very helpful for me

if j_w a vector where elements are [1,5,3,10,2,1,0,4]

with the command "row, col, val := SearchArray(j_w);" I have all information about j_w. Iwant to get just the indices of nonzero where the values of j_w<=3 for example?

Best regards

Hi

In matlab we have this command:

I = FIND(X) returns the linear indices corresponding to the nonzero entries of the array X.

[I,J,V] = FIND(X) also returns a vector V containing the values that correspond to the row and column indices I and J.

Is there a command in Maple like "find" in Matlab

Thanks in advance

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