CODEWITHSUNDEEP
matrixwolfram-mathematica
José D.
José D.

Reputation: 4275

Modify an element of a matrix

Im trying this but doesn't seem to work:

A  = {{1,2},{3,4}}
A[[1]][[2]] = 5;

How could I do that?

Currently I'm doing

list = {3,5};
A[[2]] = list;

Upvotes: 2

Views: 242

Answers (1)

Dr. belisarius
Dr. belisarius

Reputation: 61016

Your code is right, except for a minuscule error :)

You wrote:

A = {{1, 2}, {3, 4}}   A[[1]][[2]] = 5; 
                     ^
                     ^
                     |
               This space means
                multiplication!

The correct code is

A = {{1, 2}, {3, 4}} ;  A[[1]][[2]] = 5;

Usually written as:

    a = {{1, 2}, {3, 4}} ;  
    a[[1, 2]] = 5;

Remember to start your identifiers with lowercase letters, as capitals are reserved for system's names

Upvotes: 1

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