Questions on the use of Mathematica to construct models for approximating empirical data.

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-1
votes
1answer
186 views

NonlinearModelFit errors and precision

For this problem, I use a data set, which I've made available here. ...
-1
votes
1answer
356 views

How to define a pure function with a Module?

I was not able to use a self defined (using Module and For loops) piecewise function to fit data. It seems that the problem is that I have to define a pure function. I would like to learn how to ...
-1
votes
1answer
124 views

FindFit and Integration errors

First off, appologies for what may sound like a newbie question, as I am very new to using Mathematica. I am trying to find a way to get Mathematica to give me an expression that would describe the ...
-2
votes
2answers
127 views

How can I use NonlinearModelFit with multiple variables? [closed]

I am trying to find the coefficients for following equation: $\quad \quad f(x,\,y,\,z) = a (x^2)\, exp(b x + y^2) + c z^2 y$ using NonlinearModelFit. But I can't ...
-2
votes
1answer
91 views

Computing least squares error [closed]

I have a mathematica subroutine setup that computes the least squares approximation as follows ...
-2
votes
1answer
101 views

A piecewise function with way too many pieces

I'm currently calculating a periodic square wave current function to feed into a particle accelerator. It's a square wave that ramps up to a certain frequency and then drops back to the base frequency ...
-2
votes
0answers
31 views

How can I fit two datasets with common fit parameters? [on hold]

I have two datasets, say data1 and data2, which can be modeled by the functions f1[params__] ...
-3
votes
0answers
35 views

Polynomial Equation/Function With Even Degree Order [on hold]

I have the following data for $x$ and $y$ axis, which I am reading from an Excel file by using the Import command and plotting by using the ...