Method to plug in a value

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Aaron Atkinson
Aaron Atkinson 2020-3-1
回答： Arramis 2024-1-21
I am currently working on a bracketing algorithem (specifically false position for finding roots).
My issue is that the equation will be imputed as ways such as (x+(4*x^8)).
I need to be able to plug in the variables x_i and x_u into that equation as a susbtitute for x?
What would be the primary way I should go about doing this in a loop?
  1 个评论
dpb
dpb 2020-3-1
W/o seeing far more of code I'd guess just write an anonymous function and call it with the desired input...
fnF=@(x) x+4*x.^8;
If it's always some form of a polynomial, one could also just set the coefficients vector and call polyval
b=[4 0 0 0 0 0 0 1 0]; % 4x^8 + x
F=polyval(b,x);

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采纳的回答

Thiago Henrique Gomes Lobato
I would agree with dpb that the best way is to use anonymous functions, the only thing that you additionally need is to be able to convert the user input to the function. A way to do it is with the eval function:
Equation = 'x+4*x.^8';
fnF= eval(['@(x)',Equation])
fnF =
function_handle with value:
@(x)x+4*x.^8

更多回答（1 个）

Arramis
Arramis 2024-1-21
how to enter and into mat lab as the equation u=x+y

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