Question

Determining the amplitude of peaks on a slowly changing signal?

So as we all know, findpeaks will return the value of a peak using, e.g., [pks locs] = findpeaks(data, x); My question is, ho...

1 year ago | 1 answer | 0

Question

Positioning Axes using arrays

I have this simple code % create smaller axes in top right, and plot on it axes('Position', [.32 .22 .25 .15]) box on plot(...

1 year ago | 2 answers | 0

Question

Optimising my data importer for large datasets

So I have this txtFiles = dir('*.txt') ; %loads txt files N = length(txtFiles) ; Numit = N; [~, reindex] = sort( str2dou...

1 year ago | 1 answer | 0

Question

3 subplots with the bottom one split in 2 vertically?

I want to produce a figure with 3 stacked plots where the bottom one is split in half vertically, how might I do this? TIA

1 year ago | 3 answers | 0

Question

How to set default axes tick using groot?

I tried to set axis tick using set(groot,'XMinorTick','on','YMinorTick','on') But it gives an error. any idea how to fix?

1 year ago | 1 answer | 0

Question

Finding peaks greater than a set value

I'm using for h2 = 1:size(udata,1); [pks,locs] = findpeaks(udata(h2, :), x); pksc{h2,:} = pks; ...

1 year ago | 2 answers | 0

Question

How can I rewrite this to get peak locations?

I have this amps = arrayfun(@(h2) max((findpeaks(udata(h2, :), x) < 0.99)... .* findpeaks(udata(h2, :), x)), 1:size(udata...

1 year ago | 2 answers | 0

Question

Finding peaks with a set amplitude range?

I'm findint the peaks in a signal wich have an amplitude between 0.2 and 1. Trouble is when I call findpeaks via [pks,locs] ...

1 year ago | 2 answers | 0

Question

Detecting peaks with a specified range of amplitudes?

Say i have a signal with range betwene [-3, 3] and I want to locate peaks within an amplitude range of say [0, 1], how might I d...

1 year ago | 1 answer | 0

Question

Converting an array slicer to Python

I have this code in MATLAB (attached below) and wondered how I'd go about converting it to Python seeing as it keeps giving me a...

1 year ago | 2 answers | 0

Question

How to merge and slice arrays of different sizes?

Say I have one aray called `ydata` which has dimension 1x24000 and I want to slice a part of this array, say from index 2:3000 a...

1 year ago | 2 answers | 0

Question

Function which creates a vertical line (Heaviside or something) which has a double gap in it

I want to create a function which produces something like this where we have a vertical line which has a gap in it. https://i....

1 year ago | 1 answer | 0

Question

Does MATLAB have inverse tangent integral TI2(z)?

In Mathematica, one calls the function using : (PolyLog[2, I z] - PolyLog[2, -I z])/(2 I) How dl I implement this in matlab, ...

2 years ago | 2 answers | 0

Question

How to store variable name AND value in an array?

Suppose I have some code which produces the following outputs: density = 456 pressure = 356 temperature = 66 How can I sto...

2 years ago | 2 answers | 0

Question

How to stop seperate axes plotting over the top of one anotner?

I have some code which plots on the same figure a smaller set of axes to zoom in on a specific area of the plot. This works grea...

2 years ago | 1 answer | 0

Question

Findpeaks with multiple columns

So I have an array which is sized at 2000 x 100, called bdata. I want to use findpeaks to determine the peaks in every column of...

2 years ago | 1 answer | 0

Question

extracting columns from arrays within a cell

I have a cell consisting of 8 2x1 arrays and I want to extract the second column from them all. Usually, i'd use k = cell2mat(...

2 years ago | 1 answer | 0

Question

For loop to read in sequentially named .txt files

I have a batch of txt files named "0, 2, 4, 6, 8".txt and wondered if there was a way for me to read them all in as one batch us...

2 years ago | 1 answer | 0

Question

How to assign a list of variables to an array efficiently

I have a list of variables: a = 1; b = 4; c = 7; d = 8; e = 9; And want to convert them into an array. It doesn't seem ...

2 years ago | 1 answer | 0

Question

poly1 gives error "insufficient data"

I'm using poly11 to fit some data and keep getting this error Error using fit>iFit (line 269) Insufficient data. You need a...

3 years ago | 0 answers | 0

Question

Using a loop to impose specific values

Let's say I have a range of x going from -200 to + 200 and I want to force a function to take different initial conditions in th...

3 years ago | 1 answer | 0

Question

How to specify a row and column in an array

So I have a 5x80 array and want to write a section of code which subtracts row 1, column 1 from row 2 column 1. How might I do t...

3 years ago | 1 answer | 0

Question

Fitting a plot with interpolation

I need to interpolate some data involving a logarithm using the fit function but I'm not sure how to interpolate in matlab. Gene...

3 years ago | 1 answer | 0

Question

Using Taylor Expansions: how to impose 'large' approximations, i.e., "for large x"?

Say I have a function: and I want to see what happens in the region of large x, i.e., I Taylor expad f(x) in the region of...

3 years ago | 1 answer | 0

Question

translating commands from python

So I'm trying to translate the following code from Python: def chabrier03individual(m): k = 0.158 * exp(-(-log(0.08))**2/(2 ...

4 years ago | 1 answer | 0

Question

Why does my <= statement not work?

I'm running a simple loop that applies a less than or equal to inequality to a value. Unfortunately, it is overlooking this valu...

4 years ago | 1 answer | 0

Question

Plotting the stellar IMF and setting for loop conditions

Hi all, I'm trying to plot the stellar IMF using MATLAB and want to transfer the following Pyhon code: m = logspace(-2, 2, 400...

4 years ago | 0 answers | 0

Question

My quiver plot seems to go flat when I am plotting a coupled ode.

So the ODE system reads: and my code reads: [x, y]=meshgrid(-2:0.6:4) dx = 3*(x-1)*y; dy = 2-x-y^2; quiver(x, y, dx, dy...

4 years ago | 1 answer | 0

Question

Getting a for loop to save a plot every step

Good evening, I'll keep this brief but I'm looking to see how I can write a for loop which takes a range of constants, appli...

4 years ago | 1 answer | 0

Question

How to generate a for loop which saves a figure at a given interval?

Hello, I'm designing a piece of code which plots a contour of a field I called rho in the code. I am encountering some difficu...

5 years ago | 1 answer | 0