Warning: Explicit solution could not be found.

Sorry for disturbing you guys but i have wrote a code shown below:

upsilon=acos(x2a/6.85)

x3=47.5+5.35*cos(upsilon)

y3=5.35*sin(upsilon)

f4=(x4-x3)^2

f5=-sqrt(5.34^2-x4^2)

f6=(f5-y3)^2

x4main=f4+f6-46.7^2

solve(x4main)

y4=-sqrt(5.34^2-x4main^2)

The problem is when the warning appears saying that explicit solution could not be found.What is wrong with it?

Thanks.

Answer 1

[Andrew Newell]

Are you using the Symbolic Toolbox? I don't get any such warning. Maybe some of your variables already have an earlier definition? Try adding

clear
syms x1 x2 x3 x4 x2a

before the above commands.

Answer 2

[David]

This is what you need to do, I think.

syms x2a x3 y3 x4 y4
upsilon=acos(x2a/6.85)
x3=47.5+5.35*cos(upsilon)
y3=5.35*sin(upsilon)
f4=sym((x4-x3)^2)
f5=sym(-sqrt(5.34^2-x4^2))
f6=sym((f5-y3)^2)
x4main=sym(f4+f6-46.7^2)
solve(x4main)
y4=-sqrt(5.34^2-x4main^2)

sym() constructs symbolic objects from the input you give it and solve() requires that the equations you give it are symbolic expressions.

Note: You may not need to put sym() around the equations for f4, f5, and f6, but you definitely do for x4main.

David