Undefined function 'cosd' for input arguments of type 'logical'

The function should take floating point values and output disk width, but I am getting the error "Undefined function 'cosd' for input arguments of type 'logical'"

 .
function R_disk = disk_rad(A)
% function computes radius of respective disk as a function of the points
% Longitude
gridspc = .1;
R_earth = 6371; %radius of the earth in Km
dist_lat = gridspc * R_earth;
dist_lon = R_earth*gridspc*cosd(A);
A_grid = dist_lat*dist_lon;
R_disk = sqrt(A_grid/pi)/110.946;
end

[John Chilleri]

Hello,

This is because your input A is a logical value rather than a double.

For example:

>> A = 1 == 1

A =

       1

>> cosd(A)
Undefined function 'cosd' for input arguments of type 'logical'.

>> A = 1

A =

       1

>> cosd(A)

ans =

     0.999847695156391

You can get around this by putting an

A = double(A);

or

cosd(double(A))

Although A may be logical due to a bug in your earlier code (I would check if I was you).

Hope this helps!

[Franklyn Dunbar]

perfect, thanks