FZERO Error
in [Matlab]
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From: Kyle on 29 Mar 2010 21:31 I cannot figure out why I keep getting this error: ??? Operands to the || and && operators must be convertible to logical scalar values. here is part of my code: fun=@(t)8*x*(t^2)+Growth+Length+Width x = fzero(fun,1) Where growth, length, and width are the result of other equations in my code. I have this code in a for loop to find the value at which this function is zero at 30 different values for a particular parameter that each equation is dependent upon. What am I doing wrong?
From: Matt Fig on 29 Mar 2010 21:40 When making functions for fzero, use .* and .^ instead of * and ^.
From: Steven Lord on 29 Mar 2010 21:45 "Kyle " <kyle.bm(a)hotmail.com> wrote in message news:hork8q$ra0$1(a)fred.mathworks.com... >I cannot figure out why I keep getting this error: > > ??? Operands to the || and && operators must be convertible to logical > scalar values. > > here is part of my code: > > fun=@(t)8*x*(t^2)+Growth+Length+Width > x = fzero(fun,1) > > Where growth, length, and width are the result of other equations in my > code. I have this code in a for loop to find the value at which this > function is zero at 30 different values for a particular parameter that > each equation is dependent upon. What am I doing wrong? The function that you pass into FZERO must accept a SCALAR input and return a real SCALAR output. I suspect your function returns a nonscalar value. -- Steve Lord slord(a)mathworks.com comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ
From: Kyle on 29 Mar 2010 21:50 Yea, I tried that too. I thought maybe that was the issue since I'm using various loops and multiple values for a few variables but it still gives me that same error. What else do you think could cause this problem?
From: Matt Fig on 29 Mar 2010 21:50
"Matt Fig" <spamanon(a)yahoo.com> wrote in message <horkq6$529$1(a)fred.mathworks.com>... > When making functions for fzero, use .* and .^ instead of * and ^. Scratch that. FZERO takes scalars in and scalars out. Does your function take a scalar in and return a scalar? |