I want to determine whether the user wishes to work with their angles in degrees or radians

Hi, I have written the following code to determine whether the user want their angle to be calculated in degrees or in radians

type= input('Enter D to work angle in degrees or R for radians')
V= input('Enter velocity ');
a= input('Enter angle ');
cosine;
sine;
if (type==r | R)
 cosine=cos;
 sine=sin;
elseif (type==d | D)
 cosine=cosd;
 sine=sind;
else
 output('You failed to input a correct answer');
end

It won't work for me. I would also liek to allow the user to be able to reinput their choice in the last else statement in case they hit an invalid key.

Thanks Chris

[Walter Roberson]

Please use better tags for this question; see http://www.mathworks.co.uk/matlabcentral/answers/43073-a-guide-to-tags

Answer 1

[Walter Roberson]

input() expects numeric input unless you use the 's' option.

If you want to compare strings, use strcmp() or strcmpi()

Answer 2

[dimitris]

type= input('Enter D to work angle in degrees or R for radians')
V= input('Enter velocity ');
a= input('Enter angle ');
cosine;
sine;
if (type==r | R)
 cosine=cos(a);
 sine=sin(a);
elseif (type==d | D)
 cosine=cosd(a);
 sine=sind(a);
else
 type=input('You failed to input a correct answer, press r for rads or d for degrees');
if (type==r | R)
 cosine=cos(a);
 sine=sin(a);
elseif (type==d | D)
 cosine=cosd(a);
 sine=sind(a);
else
end

Or you can use a while loop if you want the user to reinput his choice until it's correct.