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From: Kyle on 30 Mar 2010 02:09
Can someone explain to me what exactly this means? I have "for loops" and various vector matrices in my code and when I try to use fzero, I get this error. Do I need to modify my "for loops" or something?

??? Operands to the || and && operators must be convertible to logical scalar values.
From: James Tursa on 30 Mar 2010 02:39
"Kyle " <kyle.bm(a)hotmail.com> wrote in message <hos4i0$7ki$1(a)fred.mathworks.com>...
> Can someone explain to me what exactly this means? I have "for loops" and various vector matrices in my code and when I try to use fzero, I get this error. Do I need to modify my "for loops" or something?
>
> ??? Operands to the || and && operators must be convertible to logical scalar values.

Impossible to advise without seeing the code that generated this error.

James Tursa
From: Kyle on 30 Mar 2010 03:49
Here is my code:

x=20
p=30
y=400
z=linspace(5,30,10)
x=linspace(1,10,10)
j=linspace(3,50,10)

f1=z+x+j;
fun=@(t)(0.5*x*p*y*(t^2)*((1000^2)/(3600^2)))+f1;
x = fzero(fun,1)
From: Steven Lord on 30 Mar 2010 10:08

"Kyle " <kyle.bm(a)hotmail.com> wrote in message
news:hosadg$qgv$1(a)fred.mathworks.com...
> Here is my code:
>
> x=20
> p=30
> y=400
> z=linspace(5,30,10)
> x=linspace(1,10,10)
> j=linspace(3,50,10)
>
> f1=z+x+j;
> fun=@(t)(0.5*x*p*y*(t^2)*((1000^2)/(3600^2)))+f1;
> x = fzero(fun,1)
>

What happens when you call fun with 1, your initial guess for the value of
the zero, as input? Does fun return a real scalar value, as FZERO
_requires_ of the function you pass into it?

If you're looking to solve a _system_ of equations, you need either
FMINSEARCH on the sum of the squares of the function values or, even better,
FSOLVE from Optimization Toolbox.

--
Steve Lord
slord(a)mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ


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