MATLAB: Undefined function ‘atand’ for input arguments of type ‘sym’. how to solve this error

atandsymbolic

I'm running the follow code lines
% tanB1 = X and tanB2 = Y
Cp = 1005
Ca = 200; % input



Um = 256;  % input
temp_rise = 34.5; % input
lambda = 0.84; % from stages (input)
DoR_factor = 0.5;% input
TpR = temp_rise*Cp/(lambda*Um*Ca);
DoR = DoR_factor*2*Um/Ca;
syms X Y
Eqn1 = 'TpR = X - Y';
Eqn2 = 'DoR = X + Y';
S = solve(Eqn1, Eqn2, X, Y);
soln = [S.X, S.Y];
m2 = subs(soln);
% deflection
B1 = atand(m2(1,1))
B2 = atand(m2(1,2))
% air angles from B1 and B2
A1 = atand(Um/Ca - tand(B1));
A2 = atand(Um/Ca - tand(B2));
deHall = (Ca/cosd(B2))/(Ca/cosd(B1));
% [B1, B2, A1, A2, 0, deHall];
A_angle = [B1, B2, A1, A2, 0, deHall]
But I am getting an error on the line B1,
??? Undefined function or method 'atan2' for input arguments of type 'sym'.
Any Ideas how to solve this problem?
Thanks!!

Best Answer

Tin, you need to convert the symbolic expressions. Use
 B1 = atand(double(m2(1,1)))
 B2 = atand(double(m2(1,2)))
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