Change a symbol to a number
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I am doing a system of equations, and I want to solve the equations part of the way with a variable in the place of a number for simplicity's sake and then substitute a number for that variable. It never works. I've tried subs, solve, and just about every other program that I can find, and every single one leave the variable in the equation and ignore the other code that i write. Please help.
syms k1 r theta yield v
%Mode 1 Base Equations
sigxx = k1/sqrt(2*pi*r)*cos(theta/2)*(1-sin(theta/2))*sin(3*theta/2);
sigyy = k1/sqrt(2*pi*r)*cos(theta/2)*(1+sin(theta/2))*sin(3*theta/2);
sigxy = k1/sqrt(2*pi*r)*sin(theta/2)*(cos(theta/2))*cos(3*theta/2);
sigzz = v*(sigxx+sigyy);
%Mode 1 Stresses
sig1 = (sigxx+sigyy)/2+sqrt(((sigxx-sigyy)/2)^2+sigxy^2);
sig2 = (sigxx+sigyy)/2-sqrt(((sigxx-sigyy)/2)^2+sigxy^2);
sig3 = sigzz;
v = 0.3 %plane strain
%Von Mises Effective Stress. Solve for r.
sige = sqrt((sig1-sig3)^2+(sig2-sig3)^2+(sig2-sig1)^2)/sqrt(2)==yield;
[ry] = solve(sige,r)
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Walter Roberson
2020년 2월 13일
subs(ry, yield, 5.749)
For example.
This will not change ry unless you assign the result to ry.
답변 (1개)
Swetha Polemoni
2020년 9월 3일
Hi,
In order to assign number/value to symbols “subs()" can be used. The following code snippet is for better understanding of assigning values to multiple symbols
s1=subs(sige, [k1, theta, v, yield], [value1, value2, value3, value4]);
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