清空筛选条件
清空筛选条件

Info

此问题已关闭。 请重新打开它进行编辑或回答。

How to fix 'unable to find explicit solution'

2 次查看（过去 30 天）
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.

此问题已关闭。

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.

此问题已关闭。

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by