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### #ActualKhatharr

Posted 10 January 2013 - 11:09 PM

Ahhhhh, I get it. I was thinking HxW for some reason. Bleh. Linear algebra is like the brain scrambling olympics sometimes.

So the MxN * NxP rule means you'll always have a workable number of rows and columns. Okay.

Ahh, wait.

Okay, lemme write this out...

[a, b, c]   [j, k]
[d, e, f] * [l, m]
[g, h, i]   [n, o]

Okay, so that would be invalid because it's 3x3 * 2x3?

We did one where we multiplied a 3x3 by a 1x3(vector, though he didn't call it that). Is that just considered a different case since the vector can be used for each row?

Edit - Bzzzzzzzzzt. I got it. -.-

It would be

[aj+bl+cn, ak+bm+co]
[dj+el+fn, dk+em+fo]
[gj+hl+in, gk+hm+io]

Thanks, Ravyne.

### #4Khatharr

Posted 10 January 2013 - 11:05 PM

Ahhhhh, I get it. I was thinking HxW for some reason. Bleh. Linear algebra is like the brain scrambling olympics sometimes.

So the MxN * NxP rule means you'll always have a workable number of rows and columns. Okay.

Ahh, wait.

Okay, lemme write this out...

[a, b, c]   [j, k]
[d, e, f] * [l, m]
[g, h, i]   [n, o]

Okay, so that would be invalid because it's 3x3 * 2x3?

We did one where we multiplied a 3x3 by a 1x3(vector, though he didn't call it that). Is that just considered a different case since the vector can be used for each row?

Edit - Bzzzzzzzzzt. I got it. -.-

### #3Khatharr

Posted 10 January 2013 - 11:02 PM

Ahhhhh, I get it. I was thinking HxW for some reason. Bleh. Linear algebra is like the brain scrambling olympics sometimes.

So the MxN * NxP rule means you'll always have a workable number of rows and columns. Okay.

Ahh, wait.

Okay, lemme write this out...

[a, b, c]   [j, k]
[d, e, f] * [l, m]
[g, h, i]   [n, o]

Okay, so that would be invalid because it's 3x3 * 2x3?

We did one where we multiplied a 3x3 by a 1x3(vector, though he didn't call it that). Is that just considered a different case since the vector can be used for each row?

### #2Khatharr

Posted 10 January 2013 - 11:01 PM

Ahhhhh, I get it. I was thinking HxW for some reason. Bleh. Linear algebra is like the brain scrambling olympics sometimes.

So the MxN * NxP rule means you'll always have a workable number of rows and columns. Okay.

Ahh, wait.

Okay, lemme write this out...

[a, b, c]   [j, k]
[d, e, f] * [l, m]
[g, h, i]   [n, o]

Okay, so that would be invalid because it's 3x3 * 2*3?

We did one where we multiplied a 3x3 by a 1x3(vector, though he didn't call it that). Is that just considered a different case since the vector can be used for each row?

### #1Khatharr

Posted 10 January 2013 - 10:56 PM

Ahhhhh, I get it. I was thinking HxW for some reason. Bleh. Linear algebra is like the brain scrambling olympics sometimes.

So the MxN * NxP rule means you'll always have a workable number of rows and columns. Okay.

Thanks, Ravyne.

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