Too Many Output Arguments

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Tyler Reohr 2020-10-6

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/606676-too-many-output-arguments

评论： Walter Roberson 2020-10-7

I'm using Matlab to solve for the constrained optimization of f(x,y,z) = 6x+6y+5z with a constraint of 3x^2+3y^2+5z^2 = 29.

My code looks like this:

clc
syms x y z t l
f = 6*x + 6*y +5*z
c = 3*x^2+3*y^2+5*z^2
c1 = 29
gFunc = gradient(f)
gConst = gradient(c)
eqn1 = gFunc(1,1) == l * gConst(1,1)
eqn2 = gFunc(2,1) == l * gConst(2,1)
eqn3 = gFunc(3,1) == l * gConst(3,1)
eqn4 = c == c1
[xsoln,ysoln,zsoln,lsoln] = solve([eqn1,eqn2,eqn3,eqn4],[x,y,z,l])

When I run the code, I get an error in saying that [xsoln,ysoln,zsoln,lsoln] = ... has too many output arguments, but I am solving 4 equations for 4 variables, and want 4 outputs, so I don't see how I am getting this error.

Any tips? Thanks!

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采纳的回答

Walter Roberson 2020-10-7

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/606676-too-many-output-arguments#answer_506826

在 MATLAB Online 中打开

clc
syms x y z t l
f = 6*x + 6*y +5*z
f = 6 x+6 y+5 z
c = 3*x^2+3*y^2+5*z^2
c = 3 x2+3 y2+5 z2
c1 = 29
c1 = 29
gFunc = gradient(f)
gFunc = 
665
gConst = gradient(c)
gConst = 
6 x6 y10 z
eqn1 = gFunc(1,1) == l * gConst(1,1)
eqn1 = 6=6 l x
eqn2 = gFunc(2,1) == l * gConst(2,1)
eqn2 = 6=6 l y
eqn3 = gFunc(3,1) == l * gConst(3,1)
eqn3 = 5=10 l z
eqn4 = c == c1
eqn4 = 3 x2+3 y2+5 z2=29
[xsoln,ysoln,zsoln,lsoln] = solve([eqn1,eqn2,eqn3,eqn4],[x,y,z,l])
xsoln = 
(−22)
ysoln = 
(−22)
zsoln = 
(−11)
lsoln = 
−1212

Works for me in R2020a and R2020b . Which release are you using?

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Tyler Reohr 2020-10-7

I couldn't get it to work so I reinstalled it to clear the cache or any settings I might have arbitrarily changed on accident. It worked after that so I don't believe it was a problem with the code. Don't know exactly what went wrong, but it's working now. Thanks!