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small matrix question

small matrix question

small matrix question

(OP)
Sorry for the simplicity of this question. If I have two matrices, one 1000 cells long, the other 4.5 million long. I want to multiple them to create a third matrix 4.5 million cells long, where the first cell of the first matrix multiplies the first 4500 of the second matrix, the second of the first matrix by the next 4500 of the second matrix etc. I am using a for loop but it is taking really long, is there a faster way?
thanks

RE: small matrix question

I'm not going to try it but you might want to try creating a 4.5 million long version of the 1000 cell matrix, then .* the two  long ones together.

Don't forget the . or you will really discover what a long time is.  

Cheers

Greg Locock

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