Questions on the use of Mathematica to construct models for approximating empirical data. (FindFit[], Fit[], LinearModelFit[], NonlinearModelFit[], etc.)
0
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0answers
8 views
Problem with NonlinearModelFit: “The function value… is not a list of real numbers…”
I'm trying to use NonlinearModelFit to fit the data:
Data = {{2.046204620462046, 1.274347668}, {2.012987012987013...
-2
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0answers
51 views
Trying to reconcile solution from NDSolve with analytic solution
I am very confused aboutFindFit. I have an ODE that I solve withNDSolve...
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0answers
47 views
3
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0answers
158 views
Measure length and diameter of objects in an image
I am new to Mathematica, and I am trying measure length and diameter of rectangular objects in an image. I wanted to fit rectangles in the objects, and then get the values.
Can I do that with ...
0
votes
1answer
92 views
FindFit: why do I get negative value as result?
I am trying fo fit a model to data using FindFit.
...
0
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0answers
31 views
ListLogLogPlot of imaginary fit data
I have a data set that I am trying to nonlinearfit a model to and then loglogplot the data and the fit.
The data and fit model is:
...
0
votes
1answer
58 views
Nonlinear model fit: not getting correct numerical values from model [closed]
I tried to nonlinear fit a set of data as described below. However, it appears to yield a fit solution that in appearance looks good with the plotted data set, 'dat1', however, actual fit solution ...
5
votes
2answers
84 views
Transforming noisy multivariate data
I’ve been racking my brain all afternoon on trying to solve this…
I have a set of noisy co-ordinate data
data = {{x1,y1,z1}…..{xn,yn,zn}}
that forms an ...
2
votes
1answer
61 views
Find a best fitting curve for some data with no regular pattern
Suppose some data with no regular pattern is given, so common patterns of functions all fail to fit it. Then how can one find the best fitting curve? I believe there will be some data for which we can ...
2
votes
1answer
71 views
0
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0answers
28 views
NonLinearModelFit not generating a model without the use of “BestFit”, not sure why [duplicate]
This is my first time using NonLinearModelFit and I have run into an issue that I can't find an explanation for. The fitted model contains a ...
0
votes
1answer
56 views
Nonlinear model fit and Log Log plot [closed]
I am trying to fit the log of a set of five data points (NOTE: the second coordinate(y coordinate) in each data point is already a log quantity):
...
1
vote
0answers
66 views
Can we ask ComponentMeasurements to use NonLinearModelFit to return a covariance matrix for underlying intensity data?
I'd like to be able to calculate a covariance matrix for some data underlying a morphological component. Provided this data, I can write something like:
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4
votes
2answers
101 views
How to fit a one-dimensional dataset with respect to several bounded parameters?
I have this set of data
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2
votes
2answers
170 views
How do I find the best fit?
I am trying to solve following system of three differential equations
...
