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webgl matrix

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hello.
I would understand how i can assign a value to an index in a webgl matrix.
I tryed with
var mx = mat4.create();
mx[0][0] = 0.31312312 or
mx[1][0] = 0.2222222

but don't work.
the matrices in webgl are row major or column major?
I think that i must do with only one index from 0 to 15 , but how i can calculate the indexes?

thanks

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the matrices in webgl are row major or column major?
I think that i must do with only one index from 0 to 15 , but how i can calculate the indexes?


OpenGL matrices are column major, so given matrix M with R rows and C columns, for element Mi,j the index is calculated as follows:


index = j*R + i


with i = [ 0 .. R ), j = [ 0 .. C )

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