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Question

Speeding up nested for-loop

Hi I have the following nested for-loop, containing some if-statements. It is running horribly slow, so I would be very happy...

9 years ago | 0 answers | 0

### 0

answersQuestion

Precision issues when going from Fortran to Matlab

Hi I have a piece of code written in Fortran that I have now finished writing in Matlab. They do exactly the same calculation...

9 years ago | 1 answer | 0

### 1

answerQuestion

Declaring variables with high precision

Hi I have the following piece of code that I have also implemented in Fortran. According to Fortran the variable *Ax(3,6,4)* ...

9 years ago | 1 answer | 0

### 1

answerQuestion

discrete deriviative has wrong sign

I have the following MWE that calculates the derivative of a function along the y-direction: x=1:50; y=x; phi = s...

9 years ago | 1 answer | 0

### 1

answerQuestion

Solve equation with 1 unknown numerically

I have the following script that defines a function and sets up and equation: H = @(f) sum(log(f)); f = rand(1, 1...

10 years ago | 1 answer | 0

### 1

answerQuestion

Generating numbers according to a modified Gaussian

Hi I am trying to generate numbers following a probability-distribution given by the 1D Maxwell velocity distribution, which ...

12 years ago | 0 answers | 0

### 0

answersQuestion

Nonlinear fit with constraints in R2012b

Hi I am running R2012b and doing nonlinear weighted regression as explained here: http://www.mathworks.se/help/stats/examples...

12 years ago | 3 answers | 0

### 3

answersQuestion

Nonlinear fit to data with errors in both coordinates

Hi I have a set of data (x, y), where there are measurement errors on both coordinates. These errors are non-constant, and I ...

12 years ago | 0 answers | 0

### 0

answersQuestion

Solving very stiff system of ODE's

Hi I have the following system of ODEs (a very stiff system!): eoms = @(t,x) [ 3.9e3 + 4.8e4*x(3) - 3.9e3*0.02*...

12 years ago | 1 answer | 0

### 1

answerQuestion

Solving coupled ODE's by ode45

Hi I have a relatively simple set of coupled ODE's that I am trying to solve by ODE45. The following is the content of the .m...

12 years ago | 3 answers | 1

### 3

answersQuestion

Remove every second tick on y-axis

Hi I have the following code x=-6:0.1:6; figure(1) plot(x, (1)./(1+4*x.^2), 'b') grid on When I plot this, t...

12 years ago | 1 answer | 0

### 1

answerQuestion

Evaluating integral numerically using quadgk

Hi I am trying to evaluate the following integral numerically in MatLAB: http://www.scribd.com/doc/100400549/mwe However, ...

12 years ago | 1 answer | 0

### 1

answerQuestion

Evaluate advanced integral numerically in Cartesian coordinates

Hi I have previously asked a question regarding how to evaluate a specific integral in MatLAB, see this thread: http://mathwo...

12 years ago | 0 answers | 0

### 0

answersQuestion

Plotting multi valued data properly

Hi Please take a look at my dataset here: <http://peecee.dk/upload/view/377379> It can be plotted using the following ...

12 years ago | 1 answer | 0

### 1

answerQuestion

Fit parameter not changed

Hi I am trying to fit a function to some data points. My code is the following: clc clear all close all for...

12 years ago | 1 answer | 0

### 1

answerEvaluate advanced integral numerically

Thanks for taking the time to write all that. That is very kind of you, and it gave me a big push in the right direction. Thanks...

12 years ago | 0

Question

Evaluate advanced integral numerically

Hi I am trying to evaluate the following integral in MATLAB: http://www.scribd.com/doc/100400549/mwe However I haven't had...

12 years ago | 3 answers | 0

### 3

answersQuestion

Nonlinear Fitting: Extreme uncertainties on a very good fit

Hi I have some data (x, y) (no uncertainties on either x or y), which very nicely follows an exponentially decaying function....

12 years ago | 1 answer | 0

### 1

answerQuestion

Break in the axis

Hi I have a plot of data points (x, y). The issue is that one of the first data points has a very large amplitude, whereas th...

12 years ago | 5 answers | 1

### 5

answersQuestion

Changing the vertical errorbar tee

Hi I have the following example x=1:1e1; y=x; e=sqrt(y); figure(1) errorbar(x, y, e, e) What I want is to...

12 years ago | 1 answer | 0

### 1

answerQuestion

Linear fit with data uncertainty

Hi Fitting a polynomial in Matlab to some data (x, y) is easy using polyfit as e.g. p_RvsT = polyfit(r_vs_t(:, 1), r_vs_...

12 years ago | 1 answer | 0

### 1

answerQuestion

Polyfit and parameter uncertainty

Hi I have some data (x, y), where y is proportional to x. I want to find the relationship, so I fit a function of the form f(...

12 years ago | 1 answer | 0

### 1

answerQuestion

Fitting with nlinfit

Hi I am fitting a function to some data using nlinfit in the following way [b, r, J, COVB, mse] = nlinfit(v(:, 1), v(:, ...

12 years ago | 1 answer | 2

### 1

answerFitting a convolution

Andrei's suggestion works, but when I increase the resolution of x, then the convolution changes as well. Is this just a propert...

12 years ago | 0

Question

Fitting a convolution

Hi I have the following piece of code: ---------------------------------------------------------------------------------...

12 years ago | 2 answers | 0

### 2

answersFitting data with two peaks

If I use this approach http://www.mathworks.se/support/solutions/en/data/1-GNRWCU/index.html, is there a way to obtain the error...

12 years ago | 0

Question

Fitting data with two peaks

Hi I have some data, which is not too different from the top graph in this picture: http://www.aanda.org/index.php?option=com...

12 years ago | 5 answers | 0

### 5

answersQuestion

Normalize data set

Hi I have a data set giving me (time, voltage), and I wish to normalize the data set. Is there a smart way to do this in MatL...

12 years ago | 2 answers | 0

### 2

answersQuestion

Fitting in MatLAB

Hi I have a dataset, which I am trying to fit to a function having the form A*cos(a*x) + B*sin(b*x) + C/x + exp(-D*x). ...

12 years ago | 1 answer | 0

### 1

answerQuestion

Help with 'fminsearch'

Hi I am fitting an exponential to my data using least squares, as in: ****************************************************...

12 years ago | 2 answers | 0