Bjorn Gustavsson

UIT, the Arctic University of Norway

Last seen: Today | Aktiv seit 2001

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Contour plot: distorted contours and blank spaces in plots.
The reason you get these jagged contour-lines is that the triangulation-based interpolation you use is based on a Delaunay-trian...

etwa 15 Stunden vor | 0

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Non-pixelized image using imagesc (or alternatives)
That was not an immage you linked to but rather a movie (at a push a sequence of images). The first frame seemed reasonably simi...

ein Tag vor | 0

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changing ticks position on the graph
If you have coordinates for the edges of the cdata-elements then you can either adjust things manually to get what you want: dx...

ein Tag vor | 0

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mis match matrix dimension
As the commenters have indicated your request is to non-specific to have one solution, while we all expect you to have one speci...

3 Tage vor | 1

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Take the derivative of a SYMBOLIC Matrix with respect to a Vector
You might get close enough with jacobian to get the full output: syms x y real % simple 2 x 2 matrix: M = [sin(x+y) cos(x*y);...

10 Tage vor | 1

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Calculating the eigenvalues of simple shapes
If you have a binary image then why not just run through the svd and see what you get: I = zeros(256); I(64:(64+128),64:(64+12...

17 Tage vor | 0

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Use of ODE45 for concentration plot help
To the best of my understanding you should include all three species in the ode-function. Perhaps something like this: function...

etwa ein Monat vor | 0

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How to describe loop for my ODE equations?
Write a function for these coupled ODEs. Inside that function you can use all the normal programmig tools and tricks you can thi...

etwa 2 Monate vor | 0

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Locking the Legend even if the object is deleted
If you explicitly set the axis of the plot, then you can hide objects outside the visible are and use their handles for the lege...

etwa 2 Monate vor | 0

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Neural network for curve fitting (estimating function parameters)
In any type of parameter fitting problem you're facing the curse of dimensionality in one form or the other, because the number ...

etwa 2 Monate vor | 1

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Image analysis for speckle pattern
A couple of things I'd try would be to determine the size-distribution of the speckles at different intensity-levels. This I'd d...

etwa 2 Monate vor | 0

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Multiple curve fitting via optimization
For this type of problem I would use lsqnonlin, so read the help and documentation of that function and what additinoally you ne...

2 Monate vor | 2

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Why cant I get a stable Cranck Nicolson discretization?
(caveat: I didn't run your code or analyze it, but speak from my experience with CN) Most likely you take too long steps in time...

2 Monate vor | 0

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Passing a matrix between several callbacks
If you have all your user interface in one figure (some calculator-like programme), then one way to store the matrix is in the '...

2 Monate vor | 0

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Joint Probability Density estimation function
Search the excellent File Exchange for everything you need but cannot find in your matlab-installation! Here's what comes up wh...

2 Monate vor | 0

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Integrating a line integral e^x(sinydx + cosydy) over an ellipse 4(x+1)^2 + 9(y-3)^2 = 36
For the integration you should use Green's theorem. It is beautiful, especially for this case. For the vector-field-plot you ca...

2 Monate vor | 2

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How to calculate a double integral inside the domain of intersection of two functions?
Perhaps you can use Green's theorem (you'd be very lucky if you could - but if you were to be that lucky in this case it would b...

2 Monate vor | 0

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Create a function handle that is a sum of function handles
Your specification is a bit ambiguous to me, but if I interpret it such that you want to fit a function such that: (I've used...

3 Monate vor | 1

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How can I find the filter bandwidth of Savitzky-Golay filtering?
QD suggestion: x = randn(4096,1); x_sgf = sgolayfilt(x,order,framelength); fx = fftshift(fft(x)); fxsgf = fftshift(fft(x_sgf...

3 Monate vor | 0

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Further processing of contour plot data
I would not do the average of the contours in a region, because if you have a rather flat region with a single spike in some reg...

3 Monate vor | 1

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Check summation from n=0 to 5 |n><n| in MATLAB?
If |n><n| is the same as <n||n> then you should have a look at the help and documentation to dot. That function will not general...

3 Monate vor | 0

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Decimal indexing for arrays in MATLAB
Have a look at the help and documentation for griddedInterpolant. That function might be what you're looking for. It creates a f...

3 Monate vor | 1

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Beantwortet
How can I plot 18 lines in different colors on a single plot?
For that type of tasks I have had good use of the cmlines-function in the colormap-and-colorbar-utilities toolbox on the file ex...

3 Monate vor | 0

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How to adjust a curve fit such that it goes through a specific point
If this is a plot of an electron-density profile observed with an IS-radar, then your ionosonde fOF2 point is (expected to be) a...

3 Monate vor | 0

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i have a loop which runs from 1 to 7 producing four different figures per run. How do i automatically save each of these figures inside the loop. The loop is given below.
One thing I regularly do is something like this: fig_basename = 'My_current_fig'; for i1 = 1:7 %plot-and-decorate-code f...

3 Monate vor | 0

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How to rearrange random binary input for each iteration?
Have a look at the nextperm tool on the file exchange. It will allow you to cycle through all permutations. HTH

3 Monate vor | 0

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Combine different size matrix
If your D is a scalar that you want to expand into a diagonal matrix then perhaps you can do something along these lines: szA =...

3 Monate vor | 0

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How to detect wide ball in cricket using MATLAB. What should be the simple code for it.
One thing you can (should) try is to look at the differences between frames, that is subtract the previous frame from the curren...

3 Monate vor | 1

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How to extract data from specific row
You can do things like this in matlab: data_oi = data(data(:,1)==1|data(:,1)==2,:); This wouild give you your data of interest...

3 Monate vor | 0

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Beantwortet
issue with colormap (colorcube)
Check that/if/how the two m-files differ. If they differ, copy the one you like better to the other system into a directory you ...

3 Monate vor | 0

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