MATLAB: Output argument “y” (and maybe others) not assigned during call

MATLABoutput assignment

function y = ycal(x,x0,a)
gamma=0.021;
L=0.3*10^-2;
theta=0;
d=0.3*10^-3;
E=72*10^9;
I=3.976*10^-16;
A=2*gamma*cos(theta)*(2*a+d);
L1=x0;
offset=0.3*10^-3;
if(x<=L1)
y=(A/(E*I))*(x^3/6-(L1+a)*x^2/2)+offset;
elseif(L1<x&&x<=(L1+2*a))
T=(1+(L1)/2*a)/6;
U=(L1+a+(L1^2)/4*a)/2;
V=1/48*a;
W=L1^3/12*a;
X=L1^4/48*a;
y=(A/(E*I))*((x^3*T)-(x^2*U)-(x^4*V)+(x*W)-(1*X))+offset;
elseif((L1+2*a)<x&&x<=L)
Y=(L1^2+a*L1+(2/3)*a^2);
Z=((2/3)*L1^3+(2/3)*a^2*L1+(3/2)*a*L1^2+a^3/3);
y=(A/(E*I))*(-x*Y+Z)+offset
end
end
I'm getting this error"
Error in ycal (line 2)
gamma=0.021;
Output argument "y" (and maybe others) not assigned during call to "C:\Users\Admin\Documents\MATLAB\Proj\ycal.m>ycal"."
Could someone find the mistake please?

Best Answer

What is the function supposed to return for y = ycal(1,0,0)? It doesn't pass any of the conditionals in the if statement. And since there is no default value for y, it cannot assign an output for y. Therefore, you need to handle the default value for y, perhaps by putting:
else
  y = NaN;
end
Or something to that effect.
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