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Newest 'fitting' Questions - Mathematica Stack Exchange
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Learn more about TeamsQuestions tagged [fitting]
Questions on the use of Mathematica to construct models for approximating empirical data.
1,781 questions
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1
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1
answer
130
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Difference between Mathematica NonlinearModelFit and Excel Solver? [closed]
Sorry if this is a stupid question. I was wondering what the difference is between Mathematica NonlinearModelFit and Excel solver if you set up excel to minimize the sum of squared residuals. I've ...
0
votes
0
answers
106
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NonlinearModelFit finds only "fake" minima
I'm trying to fit the parameters of a function that, since it's the result of many complicated calculations, cannot be expressed analytically, but only calculated.
Let me write it as
...
5
votes
3
answers
508
views
Fitting many peaks to dataset
I have the following dataset:
dataset
I am trying to fit this with a series of gaussians, without overfitting. I have tried the following,
...
0
votes
0
answers
80
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Fitting experimental data with a convolution of two functions - how to speed up such calculations?
I am trying to write a program that fits experimental data with a convolution of experimental instrumental response function (IRF) with several Exponential functions. This is what I coded so far.
Here ...
3
votes
1
answer
163
views
Find Fit function to my plot
I want to solve this equation and find Z.
But solving this equation is difficult due to the complexity of its functions. So, I used a numerical method and managed to plot Z as a function of changes ...
3
votes
2
answers
199
views
Fitting an experimental data using Nonlinear Model fit having four unknown parameter which need to find out from fitting
I am new to Mathematica. I am trying to find out four unknown parameter
by fitting an experimental data with the formula given below by using Nonlinear Model
Fit.
The two-band model for Hall ...
0
votes
1
answer
103
views
FindRoot in FindFit
I have a data named Hc2Tdata where its plot is shown in the first figure. The x-axis is $T$ while the y-axis is $H_{c2}(T)$. I want to fit this with the equation ...
- 787
1
vote
1
answer
116
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Confidence intervals in NonlinearModelFit , extract the numbers
How do I get the confidence intervals from NonlinearModelFit so that I can use them in subsequent calculations?
In this example I generate some data and then use <...
1
vote
3
answers
181
views
How can I fit two datasets simultaneously using two different functions but with the same parameters?
There are two sets of data: firstHalf and secondHalf. Both firstHalf and secondHalf are fitted using the models modelPositive and modelNegative, respectively. Both models use the same parameters: MS, ...
0
votes
0
answers
65
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Using FindFit for non linear model fitting how to calculate standard deviation of fitted parameters?
Is FindFit function of Mathematica works faster than NonLinearModelFit ?? I found FindFit works much faster in my model (almost 8 times). Can someone helps me how to calculate the standard deviation ...
0
votes
0
answers
101
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Given six points in P^3 with no four coplanar, how do you compute the unique twisted cubic passing through them
A twisted cubic has parametrization $A\pmatrix{1\\t\\t^2\\t^3}$ for a nonsingular 4×4 matrix $A$
https://en.wikipedia.org/wiki/Twisted_cubic:
Given six points in P3 with no four coplanar, there is a ...
0
votes
0
answers
97
views
Is this possible to get symbolic result for this polar integral for these two cases?
This is the integrate.
$$
\int_0^{2\pi}
\!\!\!\int_0^R
\frac{k\,r^{2}\,\bigl(a - r \sin\theta\bigr)}
{\Bigl[r^2 \cos^2 \theta + (\,a - r \sin\theta\,)^2\Bigr]^{3/2}}
...
2
votes
2
answers
171
views
Can I extract initial parameter guesses from FittedModel output from NonlinearModelFit?
I'm writing a helper function to summarize a fitted model produced by NonlinearModelFit, I wish to makes plots of the initial guess, the initial guess residuals, ...
- 1,285
0
votes
2
answers
210
views
How to predict time series?
I have the precipitation of twelve months (t=1,2,...,12) as below.
o = {30, 40, 50, 60, 70, 80, 90, 100, 70, 50, 40, 30};
I have estimated the rainfall using this ...
2
votes
3
answers
158
views
Fit two dimentional gaussian in dataset
I have a dataset which is a moderately large (1200x1200) array of values. A part of that array has the data that is gaussian along the 2 diagonals. Find the general area of the peak is trivial with a ...
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