Questions on the interpolation functions in Mathematica (Interpolation[], ListInterpolation[], FunctionInterpolation[], InterpolatingPolynomial[], etc.)
2
votes
3answers
174 views
2
votes
1answer
270 views
Interpolating 2D data with missing values
I have a list (21 x 21) containing values. I want to eliminate slots containing zeros by interpolating the nearest values and overwriting the zeros. How do I use the Mathematica's ...
2
votes
2answers
139 views
How to create InterpolatingFunction from data?
If I have a function at a number of non-uniformly spaced data points:
youtReal[7.8]=2.0332;, youtReal[8.54]=6.24352354;..................
......... and the ...
2
votes
1answer
147 views
How to generate a formula of a graph with three key points
I have three key points on a graph. How do I find out what the formula for this graph would be?
The points are:
(3,0) (5,2) (7,6).
It is known that the graph will be a quadratic.
Thanks
2
votes
2answers
88 views
Defining a function by pieces using list of interpolated functions in order to use `FindRoot`
I have two lists with the interpolated functions
...
2
votes
1answer
107 views
Interpolation on large 2D list results in erratic function
Previously, I've had problems with Mathematica interpolating and plotting 3D lists, but I finally managed to do so by rescaling the x and y-axes with the help of the methods proposed here. Now my ...
2
votes
1answer
197 views
using interpolation functions in ParallelMap
Edit
I am editing the question to give a simple workable example. It is at the bottom under the heading Example. The original question is now headed withe Background.
Background
I am trying to ...
2
votes
1answer
599 views
How do I prevent NIntegrate::inumr errors within other functions?
I believe this question is best illustrated with a simple example. If I run
FunctionInterpolation[NIntegrate[a + b, {a, 0, 1}], {b, 0, 1}]
I get errors of the ...
2
votes
1answer
77 views
InterpolatingFunction with growing Domain
I want to find roots of a function that is very slow to calculate (the function itself involves a bunch of FindMaxima) so I interpolate the function in a region where I think it likely the the root ...
2
votes
0answers
148 views
How to make 3D object smooth?
This thread considers mathematical methods here to make the 3D object smooth but this question consider how to achieve the goal of smoothing a 3D object in Mathematica.
I want to get smoother ...
1
vote
1answer
222 views
Mapping and Interpolation
Does Mathematica have a mapping function like scipy or any of the multidimensional ones?
By this I mean something like mapping $[1,100]$ onto $[7,20]$ for example.
Looking at Interpolate I only ...
1
vote
2answers
115 views
Using FindRoot with an interpolating function
This question bears resemblance to a few other questions on mathematica.SE about finding points of intersection of crossing curves. I know that the guidebook of numerics has an entry about the whole ...
1
vote
2answers
70 views
Interpolation of an upper-triangular list
I have 2d list which is upper triangular. I would like to interpolate it, but I cannot unless I set the interpolation order to 1. I tried making the list rectangular by filling the bottom half with ...
1
vote
2answers
284 views
Interpolating a function of two variables
I am trying to create the interpolating function for a function of two variables, over a finite area. Just for consistency we can think of a function:
...
1
vote
1answer
112 views
Trying to generate a function from InterpolatingFunction with FunctionInterpolation
Here is the code (I'm sorry to give you such a complex code sample but I failed to reproduce the error with a simpler InterpolatingFunction):
...
1
vote
1answer
196 views
Interpolate specific columns of data
I have a txt file with 3 columns of data:
x y1 y2
How do I import the file then create 2 functions, one interpolated with {x,y1} values and the other interpolated with {x,y2} values?
This ...
1
vote
2answers
139 views
Doing an Interpolation through a list of lists into a single function
Suppose I have a list of lists, i.e.
list = Table[{x, x^ k}, {k, 1, 10}, {x, 0, 1, 0.05}];
and I want to interpolate each of the lists by a function using ...
1
vote
1answer
171 views
1
vote
1answer
187 views
Optimizing the fitting of Ordinary Differential Equation(NDsolve) involving interpolation functions
I am a newbie to this forum. I am trying to use NDsolve to solve some ODEs involving the interpolation function. Then, I will compare the fitted curve and data to determine the ODE coefficients.
...
0
votes
1answer
204 views
Interpolating 2D data [duplicate]
Possible Duplicate:
Interpolating 2D data with missing values
I am trying to interpolate a 21x21 array of values. The 21x21 array sometimes has zero values and with the help of ...
0
votes
1answer
64 views
Notation for numerical solutions to differential equations
Can somebody explain this notation to me? Using Mathematica's first example in the NDSolve documentation:
...
0
votes
2answers
108 views
Correct use of ListInterpolation
I have a small problem with ListInterpolation. I want to use ListInterpolation to postprocess result of a numerical simulation. ...
0
votes
1answer
101 views
Solve 1-D function that has 2-D interpolating functions
I need some helps on NDSolve. Here are my equations:
...
0
votes
1answer
52 views
How to work with Interpolated Functions? [closed]
I am just a beginner and struggeling with experimental data and further processing in Mathematica:
I first constructed a table from two columns (t20 and J20) in Excel:
...
0
votes
1answer
133 views
How to add derivatives to Hermite Interpolation?
I try to use
InterpolatingPolynomial[{f[1]=2,f'[1]=3,f[2]=6, f'[2]=7, f''[2]=8}, Method->"Hermite"]
in WolframAlpha, but it's wrong.
0
votes
1answer
316 views
Fourier series of interpolating function result of NDSolve
I am having a tough time formulating the right question but here goes.
I know that solving the pde as in here gives me an interpolating function. I understand that the interpolating function object ...
0
votes
0answers
38 views
Interpolation and points of non-differentiability
I have some data, which if expressed by some elementary functions, would contain a non-differentiable point. I would like to be able to use something like interpolate to convert the data into a ...
0
votes
1answer
134 views
Can an Interpolation function be 'saved'? [duplicate]
Possible Duplicate:
Save interpolated function
I am importing tables with sizes of 100k - 500k rows and 4 columns. The larger the table, the slower my Mathematica runs for all computations ...
-4
votes
4answers
234 views
Piecewise linear Interpolation between data points
Is there some sort of functionality built into Mathematica that will let me linearly interpolate between (x, y) pairs of data in an array?
Example: I have the two points (1, 10) and (2, 20), how can ...
-4
votes
1answer
109 views
Problem with interpolation
I have a problem with the function interpolation. when I use it my points are all very shifted. Do you have an idea of the solution?
...
