# All Questions

0answers
18 views

### Substutution of Ansatz of an ODE

I am only beginning to learn to use Mathematica, and got stuck while trying to implement what is apparently a simple substitution rule. So I have a second order ODE in f, and I want to put in the ...
0answers
20 views

### error message when using Spline method in Interpolation

I'm using LTNOspline = Interpolation[DiscreateLT, Method -> "Hermite"] where ...
0answers
23 views

### How to find Eigenvalues of Sturm-Liouiville problem? Getting wrong Imagenary Eigenvalues

I want to find Eigenvalues of following Sturm-Liouville problem D[(2 - MA/\[Kappa][s]) q'[s], s] + W \[CapitalOmega]^2 q[s] == 0, Where [CaptialOmega^2] is ...
2answers
25 views

### TimeSeriesAggregate—reformatting the date

Compute Aggregated Statistics for a Time Series The article linked to above provides a sample of aggregating time series data. ...
1answer
26 views

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2answers
26 views

### Read timeseries data from CSV

I am new to Mathematica and have v10. I would like to you use the new TimeSeriesAggregate[tsdata, "Quarter", Total] feature to return aggregated descriptive stats. I import a number of columns of ...
0answers
2 views

### Maximum Likelihood Approach for parameter estimation of multi response data, could you provide a tutorial? [migrated]

I was trying to fit the parameters a time dependent system coupled of ODES relate to a kinetic experiment with multi response data. example: A->B+H A+H->C+H A->D dcA(t)/dt=-k1Ca(t)-k2Ca(t)*Ch(t)-k3*Ca(...
0answers
22 views

### Plotting Graph having coloured visuals and coloured lines [on hold]

Somebody please tell me what is "fondo" and "funcero" Plus I'm having a great difficulty in plotting a graph, my graph line doesn't show up. frustrated
0answers
24 views

### Training Hidden Markov Models using Mathematica

I have created a Hidden Markov Process with an initial probability vector, emission and transmission matrices. ...
0answers
29 views

### Mapping a List: Functions in Mathematica [on hold]

I have the code: ...
1answer
24 views

### How can I compute the difference in Y-axis values between data sets with similar X-values

I am new to Mathematica, so this might be a very basic question; however, I cannot find a solution to this and it is taking me very long. For my research I am probing the photoluminescence response ...
4answers
126 views

### Lists in Mathematica

I have a list of the form: {0.185794, {α -> 5.8794, χ -> 3.14159}}, {0.206365, {α -> 6.07943, χ -> 3.14159}}} How can I transform this list such ...
2answers
68 views

### Delete elements from a list

I have two lists, for example s={{1,3,2},{1,3,2},{2,3,1},{3,1},{2,3,1}}; c={{3},{1,2},{3}}; First element of c means that ...
1answer
74 views

### Need urgent help correcting error on Mathematica prototype

Sound synthesizers, both digital and analog, often include a parameter section for shaping the amplitude of a sound wave over time. This parameter section is commonly known as an "ADSR EG" (attack, ...
1answer
47 views

### NDSolve Step Size Effectively Zero

I'm trying to solve a PDE for a function of 2 variables. The most accurate parameterizations of this equation are very unwieldy and involve numerous piecewise elements, and so right now I'm trying to ...
1answer
105 views

### Bad interaction between Join and ListPlot (or Plot)

When you write this code: tab = {{1, 1}}; tab = Join[tab, {{2,2}}]; you expect to get the following table: {{1, 1}, {2, 2}} ...
0answers
36 views

### Key mapping an association applied to a distribution

I am attempting to import data from a database, group it according to a given identification parameter, get it's statistically relevant information, and then export it as a JSON object for ...
1answer
55 views

### Co-ordinate Points on a 3D Plot

I have a 3D graph: I want to figure out the values of the variable in the horizontal axes for which the graph has the highest value -- seeing the vertical axis, the value of variables where plot ...
1answer
36 views

### Installing MATLink without administrator privileges

This web page says that MATLink requires admin rights. First two steps to link Mathematica and MATLAB are: Add MATLAB's bin\win64 directory (bin\win32 for 32-bit versions) to the operating system's ...
2answers
126 views

### Create a 900x900 matrix and diagonalize it

I have to create a 900x900 matrix and then diagonalize it. It is something similar to the below matrix. The value of a,b,c,d....up to 900 values (which are the first column and row) are the number. ...
1answer
27 views

### NDSolve swapping between solution branches to stay positive

I have a differential equation that I wish to solve, with the requirement that my independent variable must stay positive, but do not require it to remain differentiable. My equation comes from ...
1answer
47 views

### Evaluating a list of randomly sampled triplets with a function of three variables

I'm new to Mathematica. I need to generate a list of 1000 triplets of random numbers {r, p, t}, so that 0 < r < 1, ...
1answer
66 views

### Loops and Graphics in Mathematica

I want to create a loop in Mathematica such that it creats multiple graphs for me. For example, I have a command of the form: ...
1answer
39 views

### Multiple documentation notebooks open at the same time

Is it possible to view multiple documentation notebooks at the same time without launching multiple kernels? I'm sure it must be possible.
1answer
62 views

### Unexpected behaviour of MomentOfInertia

The problem I expected Mathematica to solve rather easily is that of the calculus of a moment of inertia of a "c" section defined by the following Polygon: ...
2answers
30 views

### Drawing a GraphPlot by preserving the structure of the graph

For eg. GraphPlot[{1 -> 2, 2 -> 1, 3 -> 1, 3 -> 2, 4 -> 1, 4 -> 2, 4 -> 4}, VertexLabeling -> True] Then If I remove the edge (say ...
0answers
24 views

### ImplicitRegion RegionPlot fails for circle in 10.4.1 [duplicate]

This must have worked at some point, because the documentation for ImplicitRegion has the right picture. But when I evaluate ...
1answer
51 views

### Expand a complicated polynomial

I am entirely new to Mathematica. I am wondering whether Mathematica can help me to expand expression like the following f(x_1,\dots, x_n) = \left(\sum_i x_i\sum_j x_ix_j^2\right)^3\left(\sum_{i,...
2answers
67 views

I have: ...
2answers
82 views

### Automatically isolate the linear part of my data so that I can find its gradient?

I have some data plotted which is of bacterial growth curves, I have 96 sets of growth curves and I am wondering if there is a quick way to extract the straight line area of my growth curves in each ...
0answers
20 views

### How To Sort BarChart Data Based On the Selected Column

This sample code works fine for the category of StarData selected. What I would like to do is sort the data based on which BarChart is selected. ...
0answers
22 views

### How can I get factor of power of a variable and CoefficientList?

I have this code: ...
0answers
29 views

### Associating values of two matrices through sum

I have the following code: ...
1answer
43 views

### How to set proper time zone for weather data

I am running a query to pull historical temperature readings from Los Angeles using the following query: ...
1answer
92 views

### Discrepancy between Matlab and Mathematica

What is the difference between how Matlab and Mathematica solve State-Space and Transfer Function models? I have a $16 \times 16$ state space system for which I am calculating transfer function. ...
0answers
11 views

### Print joined string with variable superscript [duplicate]

I like to join some strings which I then like to print. A substring contains a number that I like to be printed in scientific format. An example to clearify: ...
1answer
50 views

### Distribute operator on functions

I wrote this code: ...
0answers
27 views

### How do I do Cauchy product of infinite series?

I have two series and want their Cauchy product series as a result. For instance, I want to multiply Sum[1,{x,0,Infinity}] to Sum[2,{x,0,Infinity}] The directConvolve method does not work, ...
0answers
28 views

### Why Mathematica does not Maximize when using parameter

I have recently started using Mathematica and I have got a question using it. I would appreciate if one could help me figuring out how to handle it. I have the following simple maximisation code <...
0answers
35 views

### Prime-Generating Cellular Automaton

I'm trying to use these ...
0answers
25 views

### regex patterns not working [on hold]

i am using this regex ^[[ \w\.\,\-\$\€\&]* ({[\w]+\:[\w]+})* ({=[\w ]+\.[\w]+})*]*$ and i want to match paterns like this ...
0answers
32 views

### Opportunity for ordering mathematics through symbols

Hilbert came up with the idea of grounding all of mathematics in an a priori synthetic knowledge of symbols. Mathematica also pegs all mathematical operations down under a single roof aided by ...
0answers
40 views

### What is the effect of giving ColorFunctionScaling a numerical argument?

(by making a mistake) I realised that ColorFunctionScaling can take a list of numerical arguments rather than just booleans. The following is true for ...
3answers
283 views

### Any alternative way to compute IntegerPartitions?

I tried to compute IntegerPartitions[100] using mathematica on my intel core i3 system. the system hangsup everytime. Is there another way to do such a large computation?
1answer
64 views

### How can I solve my system of simultaneous polynomial equations?

I want to solve the system of equations (y + 1)(a - x^p*y^q) == 0 (y + 1)x^p*y^q - c*y == 0 But I am getting the massage this system can't be solved by ...
1answer
75 views

### Gram-Schmidt Process

I've discovered the Orthogonalize command: Clear[x1, x2] x1 = {1, 1, 0}; x2 = {-2, 0, 1}; Orthogonalize[{x1, x2}, Method -> "GramSchmidt"] Which returns an ...
2answers
1k views

### Pixel perfect world map with no border lines

I'm trying to build a real world map in Minecraft and want a pixel-perfect raster image I can copy pixel for block. How can I modify ...
1answer
120 views

### Finding “nice” solution for under-determined system with constraint?

Consider the following equation: ...
0answers
21 views

### Does VertexAdd/EdgeAdd always simply append new vertices/edges to the old list?

I have a weighted digraph and I want to add new vertices and edges. The problem is that the EdgeWeight property value gets reset to automatic when a new edge is added. ...
1answer
56 views

### My plots are overlapping while using Show[] command [on hold]

I want to display these two equations in one graph. Both are having different values but by using Show command only single line comes in graph. My Code is: ...

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