Anyone good with Matlab programming?

[AlecBGreen]

My wife is getting ready to smash her computer :hide:

[newcriminal]

1. I think LFP is.

[struggle4progress]

2. I've done some. What problem is ms having?

[AlecBGreen]

4. oops should have replied to you so you will notice on MyDU

see explanation below

[AlecBGreen]

3. OK here's the situation

she is writing a program to average each row of a matrix but the program is averaging the COLUMNS instead. Cant figure out whats up. The only programming I took was QBasic back in middle school so Im not much help. She has been working on this all day but she's stuck on this last little piece.

[struggle4progress]

6. She has several options

One is to look up "mean" (use "help" to search or look under Data Analysis >> Descriptive Statistics >> mean) and compare

A = <1 2 3; 3 3 6; 4 6 8; 4 7 7>
mean(A)
mean(A,1)
mean(A,2)

That should make everything clear, but it depends on properties of "mean"

The other possibility is to look up "transpose" (see, for example, "um, transpose, and diag" under magic squares in the intro section) and then compare

A = <1 2 3; 3 3 6; 4 6 8; 4 7 7>
A'
mean(A)
mean(A')
mean(A)'
mean(A')'

That again should make everything clear, but it's probably more general than the previous trick

I'd recommend she do both of the above

Once she realizes how easy it is, she'll feel stupid for not seeing it before -- but that's par for the course here and unavoidable

[AlecBGreen]

7. thats it!

it was the mean(A,2) that took it from rows to columns. Thanks S4P!

[AlecBGreen]

5. we've made a breakthrough!

apparently 8 hours wasnt sufficient. It took 8 hours + asking DU + 15 more minutes :) thanks anyway yall :hi:

[UndertheOcean]

8. I see your problem was solved