Question

does anybody know the matlab program?

Answer 1

isn't it a programming language that is very math oriented?

Answer 2

yeah

Answer 3

i dont really know how to use it but my father hired a landscaper that uses it to calculate grades and stuff

Answer 4

btw i mean hill grades not school grades and he was teaching my brother how to use it

Answer 5

well here is my problem. i want the program to multiply a vector to give me zero instead it gives me a number with an exponent :S

Answer 6

here r the commands
v1=[1 1 1]
v2=[1 1 0]
v3=[1 0 0]

p1=v1
p2=v2
p3=v3

v1t=v1'
v2t=v2'
v3t=v3'

p1t=p1'
p2t=p2'
p3t=p3'

p1=v1

%Projection of v2 on p1
a=((v2*p1')/(p1*p1'))*p1

%Perpendicular vector of p2
a2=v2-a
p2=a2
a2t=a2'

%See if p1 and p2 equal to 0
m=(a)*(a2')

%Projection of v3 on p1
a3=((v3*p1')/(p1*p1'))*p1

%Projection of v3 on p2
a4=((v3*p2')/(p2*p2'))*p2

%Perpendicular vector of p3
a5=v3-a3-a4

%Answers
p1=v1
p2=a2
p3=a5

Answer 7

and this is wut the program give me
m =

5.5511e-017

Answer 8

ergh i dont have matlab on my macbook pro you have to get it on my brothers computer

Answer 9

well idk my brothers not home right now so i cant help, but maybe you should ask in the computer science section too.

Answer 10

oh i didnt know they have it XD

Answer 11

well thats ok, im sure those guys can help cause i am crap at programming

Answer 12

same :S

Answer 13

:( well go to the computer section then cause i dont think anyone here knows matlab

Answer 14

I just uploaded your code into matlab and I got:
v1=[1, 1, 1]
v2=[1/3, 1/3, -2/3]
v3=[1/2, -1/2,0]
Where are you getting the error? The non-zero value?
Are you by chance using "octave" instead of matlab? octave is a matlab clone that I've had issues with rounding. It would give me some values like you mention.
Finally I just gave up and moved to actual matlab...

Answer 15

i am using matlab. idk y its giving me a number w/ an exponent. and yes i got the same answer for v1,v2 and v3

Answer 16

the part ia m getting an error is the
%See if p1 and p2 equal to 0
m=(a)*(a2')
i want the output to be 0.

not this XD
m =

5.5511e-017

Answer 17

Okay I see it. When it calculates m=a*a2'
The problem is, it's rounding some stuff.
I would leave as many operations implied as possible.

Answer 18

so just take it off and leave it alone?

Answer 19

don't go a*a2'
do:
m=((v2*p1')/(p1*p1'))*p1*((((v2*p1')/(p1*p1'))*p1)-2)'

Answer 20

Leave operations implied. Don't calcluate a and a2, leave the operations that make them up. I think it should work.

Answer 21

i just did ur command rudy and now its giving me this
m =

-2.6667

Answer 22

I messed up on some parenthesis. Because I just did:
(((v2*p1')/(p1*p1'))*p1)*([1 1 0]-((v2*p1')/(p1*p1'))*p1)'
and got the same rounding off value:
5.5511e-017
Still, I would leave even more operations implied. Don't calculate anything if possible. Just leave it all implied.

Answer 23

Although, it seems v2 is the only thing left to replace...

Answer 24

Actually, also replace each vector. p1=[1 1 1], p2=[1 1 0], etc.

Answer 25

Gotta go right now. I'll try to work on this later.

Answer 26

kk thank u for ur help