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Re: Passing more than an initial guess to a function used by NEWTON [message #75353 is a reply to message #75351]

Thu, 24 February 2011 12:32

penteado
Messages: 866
Registered: February 2018

Senior Member
Administrator

On Feb 24, 5:13 pm, fgg <fabioguimaraesgoncal...@gmail.com> wrote:
> I'd like to solve an equation from within a procedure using Newton's method. e.g.
>
> pro my_procedure
> ...
> c1 = 3
> x_guess = 2
> result = newton(x_guess, 'my_function', itmax=100)
> print, result
> ...
> end
>
> ... but I'd like to pass to my_function (i.e. the equation to be solved by NEWTON) not only the initial guess, x_guess, but also a few constants that are being defined within my_procedure (e.g., c1). Is that possible? Here's an example of my_function:
>
> function my_function, x
> return, x^2 + 5*x - c1
> end

I encountered this issue in the past, and would be interested in a way
better than system or global variables. It would be so easy if
newton() had something like the uvalues used by widgets, or it called
a method on an object.

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[Message index]

		Re: Passing more than an initial guess to a function used by NEWTON By: Jeremy Bailin on Fri, 25 February 2011 07:49
		Re: Passing more than an initial guess to a function used by NEWTON By: fgg on Thu, 24 February 2011 13:29
		Re: Passing more than an initial guess to a function used by NEWTON By: penteado on Thu, 24 February 2011 13:10
		Re: Passing more than an initial guess to a function used by NEWTON By: wlandsman on Thu, 24 February 2011 12:47
		Re: Passing more than an initial guess to a function used by NEWTON By: fgg on Thu, 24 February 2011 12:42
		Re: Passing more than an initial guess to a function used by NEWTON By: penteado on Thu, 24 February 2011 12:32

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