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how to solve this equation

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Kanav Vij
Kanav Vij 2015-6-28
回答： Walter Roberson 2015-6-28
I'm trying to solve this equation:
c=(sind(d)*sind(L)*cosd(b)) - (sind(d)*cosd(L)*sind(b))+(cosd(d)*cosd(L)*cosd(b)*cosd(h))+(cosd(d)*sind(L)*sind(b)*cosd(h))==0
solve for h, L=b=28.6
but I'm getting error:
??? Error using ==> cosd at 16
Argument should be real.
I'm using MATLAB 2010a

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回答（2 个）

Romil Shah
Romil Shah 2015-6-28
编辑：Walter Roberson 2015-6-28
%Using any value gives a proper answer...please try again
L=28.6;
b=28.6;
d=28.6;
h=28.6
c=(sind(d)*sind(L)*cosd(b)) - (sind(d)*cosd(L)*sind(b))+(cosd(d)*cosd(L)*cosd(b)*cosd(h))+(cosd(d)*sind(L)*sind(b)*cosd(h));
c =
0.7709
Walter Roberson
Walter Roberson 2015-6-28
In order for that to have happened, your "d" would have had to have been a complex number. For example if you had used
d = i;
then the problem could have occurred, as "i" is the imaginary unit, sqrt(-1). So is "j".

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