How to convert [-90 90] range of elevation angel in imgradient3 to [0 , 180]?

Hi

I'm trying to use [Gmag,Gazimuth,Gelevation] = imgradient3(I) but the range of Gazimuth and Gelevation are [-180 180] and [-90 90], respectively.

I need Gazimuth and Gelevation to be in range of [0 360] and [0 180], respectively.

As I know, wrapTo360 Wrap angle in degrees to [0 360], So can I use this function to convert Gazimuth? Right?

Beside, wrapTo180 Wrap angle in degrees to [-180 180] but I need [0 180]. Can I convert [-90 90] to [0 180] as follow:

lambda = [-90 90];

positiveInput = (lambda > 0);

lambda = mod(lambda, 180);

lambda((lambda == 0) & positiveInput) = 180;

Answer 1

[Star Strider]

Try this:

Angles180 = @(a) rem(180+a, 360)-90;

Result = Angles180([-90, 0, 90])

Result =
     0    90   180

[Negar Noorizadeh]

thanks for your help,So how about for changing [-180 180] to [0 360],how should I change your code?

[Negar Noorizadeh]

should I change it as follow?

Angles180 = @(a) rem(360+a, 360*2)-180;

[Star Strider]

Try this:

Angles360a = @(a) rem(180+a, 540);
Result = Angles360a([-180, 0, 180])

Result =
     0   180   360

That should do what you want.

[Negar Noorizadeh]

Thanks for your help

[Star Strider]

My pleasure.

If my Answer helped you solve your problem, please Accept it!

Answer 2

[Jim Riggs]

I think that if you want to convert the range -90 to +90 to 0 to 180, all you need to do is add 90 to each value. Similarly, if you have angles in the range -180 to +180 and you want them in 0 to 360, all you need to do is add 180 to the values.

[Negar Noorizadeh]

thank you Jim