[ a b ] [ e f ] [ (ae+bg) (af+bh) ] [ c d ] x [ g h ] = [ (ce+dg) (cf+dh) ]
Is this right? Matrix multiplication's not commutative, right? It's associative, though, so you can form an associative group with it and the set of real matrices: identity, inverse, closure, the works.
Man, though, my brain is atrophying. I no longer remember how to convert among log bases or how to integrate anything more complicated than a polynomial. Use it or lose it, man.
That all looks good to me. Ax + By = C lets you represent vertical lines too. (I have an unfair advantage: I maintain APIs that involve matrix algebra for imaging purposes, so I haven't been allowed to forget everything.)
It would be cruel of me to mention the number of times you tried this, as indicated by the number of email notifications I got. Even if it was only three attempts.
Whoopsy. Me and my big mouth.
I'm with jsam on this one, btw. Except for textbooks I use the web.
Well, thanks for not mentioning it. Wouldn't do to be cruel.
Please mention also that what I had trouble with was the formatting, not the matrix algebra. Even though it was in the middle of a <CODE> block, the non-breaking spaces had to be explicitly specified. You see, dammit Ronan, I'm a doctor, not a computer wonk.
I am perfectly justified in concealing elements of the truth in order to make my story more supportive of any given agenda I wish to pursue, dammit. There's good precedent for it.
I am also perfectly justified in mocking your display of knowledge in the face of my shameful confession. I didn't, after all, say, "please tell me...". Therefore, you're fair game for mockery by whatever means necessary.
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no subject
[ a b ] [ e f ] [ (ae+bg) (af+bh) ]
[ c d ] x [ g h ] = [ (ce+dg) (cf+dh) ]
Is this right? Matrix multiplication's not commutative, right? It's associative, though, so you can form an associative group with it and the set of real matrices: identity, inverse, closure, the works.
Man, though, my brain is atrophying. I no longer remember how to convert among log bases or how to integrate anything more complicated than a polynomial. Use it or lose it, man.
no subject
(I have an unfair advantage: I maintain APIs that involve matrix algebra for imaging purposes, so I haven't been allowed to forget everything.)
no subject
Whoopsy. Me and my big mouth.
I'm with jsam on this one, btw. Except for textbooks I use the web.
no subject
Please mention also that what I had trouble with was the formatting, not the matrix algebra. Even though it was in the middle of a <CODE> block, the non-breaking spaces had to be explicitly specified. You see, dammit Ronan, I'm a doctor, not a computer wonk.
no subject
I am also perfectly justified in mocking your display of knowledge in the face of my shameful confession. I didn't, after all, say, "please tell me...". Therefore, you're fair game for mockery by whatever means necessary.
Because dammit, I'm a human, not a computer wonk.
no subject
Wanna write a perl script for me?
no subject