Undefined function 'atand' for input arguments of type 'sym'. how to solve this error?
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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!!
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Accepted Answer
Mischa Kim
on 31 May 2015
Tin, you need to convert the symbolic expressions. Use
B1 = atand(double(m2(1,1)))
B2 = atand(double(m2(1,2)))
More Answers (1)
Walter Roberson
on 31 May 2015
sym atand(x)
atand(x) = atan(x * 180/sym('PI'))
If necessary use a different function name.
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