# Tagged Questions

Questions related to creating Mathematica functionality inspired by MATLAB--a proprietary numerical computing environment developed by MathWorks. This includes data import/export and other interoperability questions related to MATLAB programs, scripts, or related software.

90 views

### Different results from ode45 and NDSolve?

I am solving nonlinear ODE + integration groups using NDSolve of mma and ode45 of matlab. At last, I found that they give different results, even after I added RungeKutta method, interpolationorder, ...
62 views

### Plotting Matrix versus Matrix [closed]

So I recently started using Mathematica and I haven't been able to figure out how to simply plot elements of one matrix versus another matrix which are not directly related or are not a function of ...
81 views

### What would be the Mathematica equivalent of sparse in MATLAB?

The sparse function in MATLAB does the following: S = sparse(i,j,v) generates a sparse matrix S from the triplets i, j, and v such that S(i(k),j(k)) = v(k). The ...
76 views

### Create a Mathematica function that can be called from R or Matlab

I would like to export a function from Mathematica to allow it to be accessed from R and/or Matlab. Is there a way to do this? As an example, suppose I want to export the following (albeit ...
59 views

### Importing data from a MATLAB file to MATHEMATICA [closed]

I have been trying to import some matrices from MATLAB to MATHEMATICA. The matrices are the output after I run the MATLAB file. I had saved that file in .MAT format and trying to import it in ...
76 views

### Mapping the MATLAB SP Toolbox to Mathematica

We have some work and people where I am doing signal processing using the signal processing toolbox in MATLAB and it comes up how to translate one or another of the large number of functions in that ...
194 views

### Mathematica's Singular Value Decomposition different from another math engine [closed]

I’ve been working with SVD – singular value decomposition. Things weren’t working as expected. Thus, I looked over to Matlab and executed the following code: ...
125 views

### open Matlab sheet and plot

I have managed to import my data into mathematica, but I can't find a way to show the plot the way it was in the lab (Matlab automatically generated file usually show me a graph). Is there a way ...
204 views

### Matlab to Mathematica conversion [closed]

Is there a list of corresponding commands between Mathematica and Matlab, including Solve, NSolve, ...
48 views

### Lift and projection method in Least Squares Inverse Eigenvalue Problems [closed]

I need to implement the lift and projection method proposed by XUZHOU CHEN AND MOODY T. CHU in http://www4.ncsu.edu/~mtchu/Research/Papers/lsiep.pdf on page 7 in ...
177 views

### How to write this Matlab code in Mathematica

I have a small hiccup here. I am trying to write my Matlab code for a dynamical system in Mathematica. I have managed to get most of it except one part. The Mathematica code for the system is <...
117 views

### Mathematica does not import .mat file correctly [closed]

I have .mat file that contains a binary (0,1) matrix with size 100*100*100. I have used this syntax to import it in mathematica ...
353 views

### Does NRoots own an abstract counterpart? If not, can we write one?

We know when solving linear algebra equations, despite its abstract syntax, LinearSolve is much faster compared to Solve: ...
127 views

### how to import a matlab 3 dimensional array into mathematica

I have created a three dimensional array "data" in matlab by using the following commands : ...
475 views

### Differences between FFT and analytical Fourier Transform

In MATLAB, if I perform an FFT on a simple Gaussian spot with a phase grating: ...
98 views

### Theodorus Spiral [closed]

If the successive hypotenuses of the Theodorus Spiral are getting longer but the difference between the lengths is getting smaller reducing the distance between windings to pi, why pi?
271 views

### What is the Mathematica equivalent for corr2?

What is the Mathematica equivalent for MATLAB's corr2, which gives the correlation coefficient of two 2D matrices?
100 views

### How to import columns of data (.mat file)

I have a two 100x2 .mat file and I would like to get the elements stored as pairwise entries i.e. something like data = [{a1,b1},{a2,b2}..{a100,b100}]. Can someone help me do this efficiently?
178 views

### TransferFunctionModel and BodePlot shows different result between Mathematica and Matlab

I was doing the TransferFunctionModel and BodePlot. But the result from Mathematica and Matlab are different. The function is as follows: ...
131 views

### How to convert a matrix to MATLAB format? [duplicate]

I want to convert the following 16x16 matrix containing the variable n and some integers into matlab programming language: ...
204 views

### data manipulation in log-log scale

Say that I have the following: y[t_] := 2 + (2/10)*(1 - Exp[-t/11]) timedat = N[Table[{t, y[t]}, {t, 0, 10, 1/1000}]]; How is it possible to construct an ...
6k views

### What is the difference between Mathematica and Matlab? [closed]

I am totally a beginner to Wolfram products and I'm searching for a software to solve my math problems with. Like this math problem that I've solved using $\LaTeX$ in ...
103 views

### Transformation Matlab assignments to Mathematica expressions

From a simulation software, I obtain in a matlab file my algebro-differential equations in the following way : C_p_e = C_state/C_c; C_p_f = I_state/I_i; R_p_e = R_r*C_p_f; I_p_e = (Se_p_e-R_p_e)-...
894 views

### converting Matlab program to Mathematica code

I have the following Matlab program; ...
161 views

### The CorrelationMatrix is equal to corrcoef of Matlab?

How can I generate a matrix which is equivalent to the results of the "correlation coefficients" command (corrcoef) in Matlab? When I make a LinearModelFit, I can get a CorrelationMatrix, but is this ...
4k views

### How to get Matlab data imported with the same dimensions?

I have some Matlab image data with the following dimensions (output is from Matlab): >> size(im) ans = 86 86 3 45 The data imports just fine ...
272 views

### Having trouble translating Matlab fsolve into Mathematica

I searched the site and found that someone said FindRoot is equivalent to fsolve, however, without proper options, ...
364 views

### Making Mathematica function files like in MATLAB

I'm a MATLAB user trying to get familiar with Mathematica. I have long Mathematica sheet that spits out some matrices at the end after much math. I want to run a loop over couple of different initial ...
125 views

### How to apply different colors to different contours

I have searched the forum, I hope this isn't a duplicate question. I try to apply unique color for every contour line with the same elevation. In short, I want to create a MATLAB style contour plot. ...
503 views

### Any solution to transfer data between Python and Mathematica

I think Mathematica handles .mat file not very well, python is pretty good at this kind of jobs. In this site, there are plenty of question related to calling Mathematica from Python, or calling ...
193 views

### Is there an equivalent of “pmtm” of MATLAB?

Recently I'm spending my time implementing some patients' analysis using Mathematica Classify function. But I need to rewrite some MATLAB functions for computing ...
377 views

### NIntegrate over a list of functions

This question is the result of these other two questions. Question 1 and 2. I thought it would be better to ask a new question rather than deleting previous one. I think When ...
642 views

### Numerical integration's speed

Consider this numerical integration of Bessel function: Do[NIntegrate[BesselJ[2, x], {x, 0, 10000}], {i, 1, 100}] // AbsoluteTiming {4.033403, Null} This is ...
288 views

### Slow evaluation of NIntegrate when used as a pure function

I asked a perhaps related question here. Here is my code in below. The goal is that to define a function which must be integrated numerically. The function itself first is calculated over different ...
151 views

### System Identification from test data

I've been looking for a way to model a simple SISO system from test data using Mathematica. Something similar to MATLAB's System Identification Toolkit, that estimates a transfer function from the ...
1k views

### Dramatic speed difference of code on Matlab and Mathematica

Background: I was trying to convert a Matlab code (fluid simulation, SPH method) into a Mathematica one, but the speed difference is huge. Matlab code: ...
157 views

### Small mismatch in theoretical vs MMA solutions of a damped harmonic oscillator differential equation

I solved the differential equation $$\ddot y + 0.43 \dot y + y =0.1 \cos(2x), \quad y(0)=1,\ \dot y(0)=1 \quad(0)$$ using both the theoretical results from wikipedia and using MMA (I also tested ...
16k views

### Is it possible to export the equations from Mathematica to MATLAB?

Is it possible to export the output expressions from Mathematica computations (e.g., equations) in valid MATLAB syntax?
365 views

### Using the variable in the MATLAB workspace using MATLink or any other packages

I have a program in MATLAB and after I run the program, I get some results in MATLAB's workspace. Now, I need to use these results in Mathematica. What I currently do is that I save the workspace as a ...
453 views

### Import symbolic variables from Matlab with MATLink

I'm trying to manipulate with Mathematica symbolic expression created in Matlab. I'm using the MATLink package, and I've succedeed in importing numerical variables, but not symbolic ones : ...
455 views

### ContourPlot3D using a Matlab function through MATLink

I have a Matlab function which accepts a 3 dimensional vector and returns a single number. I want to use this through MATLink to make a 3d plot. A unit sphere: ...
243 views

### 'eps' equivalent in Mathematica

In Matlab there is a function 'eps'. eps Spacing of floating point numbers. D = eps(X), is the positive distance from ABS(X) to the next larger in magnitude floating point number of ...
212 views

### Importing data from Matlab, using data in “NSolve” and send the results back to Matlab

I have generated an image processing code in Matlab. It has several subroutines and in one of them, I should solve a system of 7 nonlinear equations. I use "fsolve" in Matlab to solve this system, ...
119 views

### Converting code from Matlab to Mathematica [duplicate]

I have the following piece of code: ...
5k views

### Calling MATLAB from Mathematica

How can I call MATLAB functions directly from Mathematica and transfer data/variables between the two systems?
368 views

### Automatically growing lists as in MATLAB?

Is there a way to add elements to a list at positions outside the current list's length? Something equivalent to the following MATLAB code snippet: ...
344 views

### Porting code from MATLAB

I'd like to switch from MATLAB to Mathematica for my research in digital signal processing. I used Mathematica a lot during the '90s but I haven't used it since then, so I might as well be a complete ...
146 views

### plot totally fragmented, WorkingPrecision,matlab comparison

I am trying to plot ...