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How to fix 'unable to find explicit solution'

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Supraja Singu
Supraja Singu 2020-11-19
关闭： MATLAB Answer Bot 2021-8-20
clear ;
%beam elements
d=550;Ast=1963;b=300;fck=30;D=600; l=4000;
n1=28; n=200;
syms fc(x)
fc(x)=0.447*fck*(1-((x/0.002)-1)^2);
%stress-strain curve of Fe500 steel
syms ft(x)
ft(x)=piecewise(x<0.00174,2*x*10^5,0.00174<=x,369.6+(x-0.00195)*102857.1429);
ft(x)=piecewise(x<0.00195,ft(x),0.00195<=x,391.3+(x-0.00226)*70000);
ft(x)=piecewise(x<0.00226,ft(x),0.00226<=x,413+(x-0.00277)*42549);
ft(x)=piecewise(x<0.00277,ft(x),0.00277<=x,423.9+(x-0.00312)*31142.857);
ft(x)=piecewise(x<0.00312,ft(x),0.00312<=x,434.8+(x-0.00417)*10380.95233);
ft(x)=piecewise(x<0.00417,ft(x),0.00417<=x,434.8);
M=input('Enter moment value');
syms kd phi
C=int((fc*b/phi),0,phi*kd);
T=Ast*subs(ft,(d-kd)*phi);
m=int(fc*x*b/(phi^2),0,phi*kd);
jd=d-kd+m/C;
eqn=(C*jd*10^(-6)==M);
eqn2=(C==T);
[a,b]=solve(eqn,eqn2,kd,phi);
  1 个评论
Star Strider
Star Strider 2020-11-19
I can make no sense out of the second throough fifth piecewise statements, and I suspect the Symbolic Math Toolbox is not able to either.
Please describe what you want to do in them.

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回答（1 个）

Pankhuri Kasliwal
Pankhuri Kasliwal 2020-11-23
This issue is related to the new MuPAD symbolic engine which replaced Maple. MuPAD does not make the same assumptions as Maple.
As a workaround, use the 'IgnoreSpecialCases' option in MuPAD to return results more like those returned by Maple.

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