Carry out action dependent on specified values for input to lie between

Sorry for the long title but I'm not too sure how I'd go about defining this in a small sentence.

I want a set of values to be chosen if the input falls within a range of values e.g. input = 135 so should fall between 90 < input <= 180.

Here's the code I'm using:

Alpha = input('Specify angle of rotation (0 - 360): ');
if Alpha > 360
    Alpha = input('Specify angle of rotation (0 - 360: ');
elseif Alpha <= 0
    Alpha = input('Specify angle of rotation (0 - 360: ');
elseif isempty(Alpha)
    Alpha = input('Specify angle of rotation (0 - 360: ');
end
Alpha = Alpha*(pi/180)

a = sqrt(((cos(Alpha)^2))*((cos(Theta)^-2)-1))
b = sqrt((a^2)*((((cos(Alpha))^-2)-1)))

if 0 <= Alpha <= (90*(pi/180))
    ZA = (2*(((cos(Theta))^-2)-1))^0.5;
    ZB = a;
    ZC = 0 ;
    ZD = b;
end

if (90*(pi/180)) < Alpha <= (180*(pi/180))
    ZA = b;
    ZB = (2*(((cos(Theta))^-2)-1))^0.5;
    ZC = a;
    ZD = 0;
end

if (180*(pi/180)) < Alpha <= (270*(pi/180))
    ZA = 0;     
    ZB = b; 
    ZC = (2*(((cos(Theta))^-2)-1))^0.5;
    ZD = a;
end

if (270*(pi/180)) < Alpha < (360*(pi/180))
    ZA = a;    
    ZB = 0; 
    ZC = b;
    ZD = (2*(((cos(Theta))^-2)-1))^0.5;
end

At the moment it is assuming the conditions of the last if statement.

Basically how do I write 90 < Alpha <= 180 so that MATLAB will be able to process it?

I think I can get away with coding this using 'elseif' to reduce the size but I'd rather sort the problem out first.

I would be very grateful for help as this is for the final part of my dissertation which is due next week.

Thanks

Answer 1

[Jacque]

I found the answer and it was simply using && e.g.

if (Alpha > 0) && (Alpha <= 90) ... end

I thought I'd add this in case anybody was interested in the answer.