simple code:

require 'matrix'
m1 = Matrix[[1,2],[3,4]]

Now I need to change element (0,0) from 1 to 5. I expected something
like the command below should work:

m1[0][0] = 5

... but the error message is '[]': wrong number of arguments (1 for 2)
(ArgumentError).

Could someone help me on that ?
Thank you
Marcio
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