How to write cos squared of angle phi ?

[mujee]

hey guys
i have some syntax problem in this statement

d=sqrt((x(1:length(x))-r*sin(phi))^2 + r^2 *cos^2(phi))

it gives me error on cos^2(phi)...can anyone tell me how to write cos squared of angle phi

 

[omara007]

Re: syntax problem

hey guys
i have some syntax problem in this statement

d=sqrt((x(1:length(x))-r*sin(phi))^2 + r^2 *cos^2(phi))

it gives me error on cos^2(phi)...can anyone tell me how to write cos squared of angle phi

what language is this ?

 

[mujee]

Re: syntax problem

matlab

 

[omara007]

Re: syntax problem

hey guys
i have some syntax problem in this statement

d=sqrt((x(1:length(x))-r*sin(phi))^2 + r^2 *cos^2(phi))

it gives me error on cos^2(phi)...can anyone tell me how to write cos squared of angle phi

try this :

d=sqrt( ( ( (x*(1:length(x))) - (r*sin(phi)) )^2 ) + ( (r^2) * (cos^2(phi)) ) )

 

[echo47]

syntax problem

Hi mujee, try replacing cos^2(phi) with cos(phi)^2

 

[mujee]

Re: syntax problem

tried both of the options, still same prob

 

[Sal]

syntax problem

Hi

The right command is cos(phi)^2 or (cos(phih))^2.

your problems may be somewhere else

Sal

 

[echo47]

syntax problem

Can you show us a complete example that demonstrates the problem? We need to see how you've defined the variables. Maybe you need to use an element-wise operator such as cos(x).^2

 

[mujee]

Re: syntax problem

yeah now i figured out the other problem
i was squaring array with ^2 instead of .^2
thank you guys for your help in correcting my syntax cos(phi)^2 was the correct way of doing it
have hit 'helped me' tab for all of you

Added after 6 minutes:

actually that x was an array...i was using wrong operator for that..i needed to use element wise operation and that i just figured out.
with cos i didnt know how to use squared cos ..thanks echo and sal for helping me out