MATLAB: ERROR : “Input arguments must be convertible to floating-point numbers”

errorhelp

Hi everyone, im getting this error:
Error using sym/min (line 98)
Input arguments must be convertible to floating-point numbers.
Error in advencedconcrete32a (line 16)
tension= min(Es*(d-c)/c*epscm*As/1000,fy*As/1000);
i guess the problem is that i use "c" before i solved it, how else can i find "c" from the equation compression= tension?
please help.
thank you very much.
b=300;  %mm

d=400;  %mm
fc=40;  %Mpa



Ecm=22*(fc/10)^0.3*10^3;  %Mpa
Es=200000;  %Mpa
As=2400;  %mm^2
fy=400;  %Mpa
epsc1=min(2.8/1000,0.7*fc^0.31/1000);
epscu=3.5/1000;
k=1.05*Ecm*epsc1/fc;
epscm=1.5/1000;
syms c
funC=@(epsc) (k*epsc/epsc1-(epsc/epsc1).^2)./(1+(k-2)*epsc/epsc1);
compression= b*fc*c./epscm*integral(funC,0,epscm)/1000;
tension= min(Es*(d-c)/c*epscm*As/1000,fy*As/1000);
solc= compression==tension;
c=solve(solc,c)

Best Answer

Replace
tension= min(Es*(d-c)/c*epscm*As/1000,fy*As/1000);
with
tension = piecewise(Es*(d-c)/c*epscm*As/1000<=fy*As/1000,Es*(d-c)/c*epscm*As/1000,fy*As/1000)
Replace
funM=@(epsc)(k*epsc/epsc1-(epsc/epsc1).^2)./(1+(k-2)*epsc/epsc1)*(d-c+(c/epscm)*epsc);
with
funM=@(epsc)(k*epsc./epsc1-(epsc./epsc1).^2)./(1+(k-2)*epsc./epsc1).*(d-c+(c./epscm).*epsc);
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