Bjorn Gustavsson

UIT, the Arctic University of Norway

Last seen: Today | 2001 이후 활성

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Curve Fitting in MATLAB
For this type of problems I learnt (before the arrival of the gui-curve-fitting tools) to use the standard function-minimization...

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2D FFT of a 4D matrix
Shouldn't this effectively be the same as running an FFT on the entire 4D-array (with some confusion about normalization-factors...

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Losing pixels with imrotate
This happens due to aliasing-effects the discrete pixel-squares will start to mix and spread out between some neighboring pixels...

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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...

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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 ...

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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 (...

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

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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...

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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 ...

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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-...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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

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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...

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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...

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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...

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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...

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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...

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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...

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