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Bjorn Gustavsson


UIT, the Arctic University of Norway

Last seen: ein Tag ago Active since 2001

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Answered
I have an array of 6,76,000 as txt file, how can I convert that into 52x13x1000.
You could try reshape, see the help and documentation of that function. If you dont get the elements in the right order with som...

ein Tag ago | 0

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Answered
Creating a gif file out of an animation
I had a great experience using gif from the file exchange to convert a series of plots into a gif-animation. Simple to use does ...

5 Tage ago | 0

Answered
How can i form a filename from MATLAB identifier and correcting sntax error in "3dinvert.m"
There are restrictions of the filenames for matlab-functions, and as far as I recall it is supposed to not start with a number (...

5 Tage ago | 0

Answered
does convex hull intersect?
You should have two file-exchange packages that solves your problem: fast-and-robust-curve-intersections curve-intersections ...

6 Tage ago | 0

Answered
How to make a line plot with a colorbar as the third variable?
When I want to plot colour-coded curves I use one of these functions from the file exchange: cline, cline-m or plot-3d-color-li...

7 Tage ago | 0

Answered
Polar Plotting of Data
The pcolor in polar coordinates is the polar version of pcolor. For those functions you will need some kind of 2-D surface-like ...

7 Tage ago | 0

Answered
how to apply stft to audio signal?
You might do this, but the call to seconds looks spooky. From audioread you get the sampling-frequency fs, that is the sampling-...

7 Tage ago | 0

Answered
Assign a value to each page of a 3D Matrix
If we stick to the first rule of programming (KISS) this should get the job done: A = zeros([3,4,5]); x = [10 20 30 2^.5 exp(1...

8 Tage ago | 0

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Answered
Find and visualize the divergence of a vector function F = yzi xzj xyk. Please help me guys, please
Simply use the divergence function. Read the help and documentation to that one. If you have analytical expressions and access t...

8 Tage ago | 0

Answered
Solving eigenvalue problem with solve_bvp
In the mat4ode function the variable Ra is undefined. How would matlab know what value to give it? What dimension should it have...

8 Tage ago | 0

Answered
how to denoising rgb image?
Well nothing but a simple goof. You simply swapped the green and blue channels in this line: restored_image = cat(3, out_redCha...

9 Tage ago | 0

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Answered
contour3-With 3 dimensions input arguments
Maybe you get what you need with the slice function, or perhaps isosurface. From my naive understanding we can draw iso-contours...

9 Tage ago | 0

Answered
How to generate a rhythm that is based on an algorithm in matlab?
1, You search for some description of the algorithm that allows you to implement it. For example 5 minutes on googles first page...

9 Tage ago | 0

Answered
How to deblur an image in frequency domain?
Most likely you have a problem with division-by-zero in the: Inv = Conv./avgFilter_fft; step. If you try to set those componen...

13 Tage ago | 1

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Answered
Find Angle using point coordinates?
You could use the general formulas for angle between vectors found here: angle-between-two-vectors-in-3d, which is a good answer...

13 Tage ago | 1

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Answered
How to randomly propagate 100 random targets with random headings (uniformly sampled over [0, 2π])
Yes. The image is constructed with pixel-resolution, that is kind of the definition of a pixel-based image sensor. You model the...

13 Tage ago | 0

Answered
How can I extend polyfit line on loglog scale ?
When you calculate yhat you only do that for the first and last element of your x-values that you use for the fit. You should tr...

13 Tage ago | 0

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Answered
Matlab 2020b "Invalid text character. Check for unsupported symbol, invisible character, or pasting of non-ASCII characters."
It might well be that the "ˆ" symbol have been encoded to some othe character than "^" (I'm completely un-interested in characte...

etwa ein Monat ago | 1

Answered
Is there a way to compress non-integer data without loss using the CFITSIO library?
If you have data in double (32 or 64 bit-format), and want to keep it that way, dont' cook up your own casting-trickery - set th...

etwa ein Monat ago | 0

Answered
the differential equations by ode45
Start with the matlab on-ramp material. To find that search for "onramp" on the web-site. After doing that you should be able to...

etwa ein Monat ago | 0

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Answered
Spectrogram: HOW TO CONTROL ZERO-PADDING for individual fft's of an ULTRA LONG sequence
Yes, in principle, zero-padding is used by spectrogram if nFFT is larger than the window-length. HTH

etwa ein Monat ago | 0

Answered
Calculus limits with MATLAB
Well get to it. If you are very new to matlab then have a look at On-ramp material - which should have you up and running faster...

etwa ein Monat ago | 0

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Answered
Remove edges from concave triangulation
You problem is dificult in principle. How are the unwanted triangles supposed to be determined? In a general enough case that yo...

etwa ein Monat ago | 0

Answered
Plot spectra and spectrogram of acceleration data
Provided that your data actually spans 5 minutes your sampling-frequency is not 48 kHz, but rather 800 Hz. That changes the outp...

etwa ein Monat ago | 0

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Answered
Which optimizer to use for SIR Epidemic Model?
One recommendation that you're not likely to like: The constant transition-probability of recovering/dieing has to be unbiologic...

etwa ein Monat ago | 1

Answered
to use tiledlayout to arrange pre-existing axes ?
When I need control of the figure layout and design I always save away the handles to "everything" - which makes it at least som...

etwa ein Monat ago | 0

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Answered
How do i transform this equation system in to three dimensions?
Since this looks like the equations of motion for a solid body falling in a constant gravitational field with some velocity-depe...

etwa ein Monat ago | 0

Answered
Change the markers color in the figure after plotting
You should be able to change the color of the points by using the hp output: set(hp(1),'color',[0.95,.3,0.1]) set(hp(2),'color...

etwa ein Monat ago | 1

Answered
learning to create functions in matlab(R2019a) but every time i try to do so , The value assigned might be un used (used a)create the file in code file, Am a beginner
Ok, here's what you're missing in this example: function a = myRand a=1+rand(3,4)*9; end Now your function has an output-va...

etwa ein Monat ago | 0

Answered
Convex Hull without the in-built function.
Take it step by step. 1, put points on paper. 2, work out how to step from the point with the smallest y-value to the next poi...

etwa ein Monat ago | 1

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