-90 to +90 degree in matlab

R

rameshrai

Member

• Mar 19, 2014

• #1

Hi,

How do i generate random angles from -90 to +90 in matlab?

thanks

 

misterT

Well-Known Member

Most Helpful Member

• Mar 19, 2014

• #2

https://www.mathworks.se/help/matlab/random-number-generation.html

 

R

rameshrai

Member

• Mar 19, 2014

• #3

Hi,

I know this, theta = 180*randi generates 0 to 180 randomly, but it is now -90 to 90 where negative values comes in, thats why I am asking

thanks

 

D

dougy83

Well-Known Member

Most Helpful Member

• Mar 20, 2014

• #4

If this is true:

rameshrai said:

I know this, theta = 180*randi generates 0 to 180 randomly, but it is now -90 to 90 where negative values comes in, thats why I am asking

Click to expand...

Then surely

Code:

theta = 180*randi - 90

will get you a number in {-90, ..., +90}.

 

misterT

Well-Known Member

Most Helpful Member

• Mar 20, 2014

• #5

What dougy83 said is true.

And if you just bothered to read the matlab help I linked, you would easily find that:

r = randi([-90 90], 100, 1);
Returns an 100x1 array of random values between -90...90.

So if you need only one random number at a time, I think one of these (or all of them) should return one random number between -90...90 :
r = randi([-90 90]); or
r = randi([-90 90], 1); or
r = randi([-90 90], 1, 1);

https://www.mathworks.se/help/matlab/ref/randi.html

 

Last edited: Mar 20, 2014

misterT

Well-Known Member

Most Helpful Member

• Mar 20, 2014

• #6

r = randi([-90 90])

That seems to work ok. I tried it out here:
https://octave-online.net/

Nice online tool btw. Try it out with the command line inputs:

octave:1> figure
octave:2> hold
octave:3> r = randi([-90 90], 1000, 1);
octave:4> plot(r);

 

R

rameshrai

Member

• Mar 20, 2014

• #7

thanks,

seems i am saturated