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Bjorn Gustavsson


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UIT, the Arctic University of Norway

1.094 total contributions since 2001

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Answered
i am getting error in line 18 of invalid use of operator.please help me solving this
OK, so you want to solve 3 coupled equations of motion for some harmonically varying solution. First you have to understand the ...

alrededor de 1 hora ago | 0

Answered
make a better map
You should try: shading flat instead of the interp option. You will have to accept the fact that you only have data in a 32-by...

alrededor de 3 horas ago | 0

Answered
Solving differential equations to get accurate plot as shown.
Since you get an oscillatory behaviour of (primarily) Cecm and Crec it is very likely that you have a bug for some of the reacti...

alrededor de 4 horas ago | 0

Answered
How to use chebop function?
Have you installed the chebfun package? Have you added the chebfun install directory to the matlab-path? If you have it install...

alrededor de 21 horas ago | 0

Answered
Improving speed of readtable
It is a rather large data-file to read. You might reduce the read-time if you use load instead of readtable - that should reduce...

1 día ago | 0

Answered
How to create and plot an oloid in MATLAB
Have a look at the help and documentation of the convhull function. That should give you a solution for this task - in the sense...

1 día ago | 0

Answered
Multidimensional integration in matlab
Have a look at the help and documentation for integral2. That should be the function to do 2-D integrals, that sounds like the f...

2 días ago | 1

Answered
Why does version R2020b gives errors when running functions such as fmincon, when version R2019a runs properly.
Have you installed the optimization toolbox in your 2020b install? If not that is where that function resides. Check the existe...

2 días ago | 0

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Answered
Simulation of Shepp Logan phaton dataset
The phantom-function is a standard .m-function available in source-code, so you can read it clean and plain. It is simply a func...

3 días ago | 2

Answered
Different line types for multiple curves
Maybe you'll have to accept looping a little: lstl = {'-','--'}; for i1 = 1:4, set(p(i1),'linestyle',lstl{rem(i1,2)+1}) en...

6 días ago | 0

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Answered
Inputs must be floats, namely single or double.
When you integrate an ODE numerically there is no need whatsoever to introduce a declaration of T as a symbolic variable (the wa...

6 días ago | 1

Answered
error occurring while solving odes using ode15s
Check your mass-matrix E and make sure it looks exactly like you expect. The 3 off-diagonal 1s looks peculiar to me. Then you ha...

7 días ago | 0

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Answered
Find Peaks error - Expected X to be strictly increasing
Check that your X-variable is actually monotonically increasing (you might have replicate points, which then messes everything u...

8 días ago | 0

Answered
The legend does not show the right marker:
When using legend it is always preferable to use an array of handles returned from the plotting functions. Try something like: ...

9 días ago | 0

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Answered
stft for complex data
Shouldn't that be as simle as: Acmplx = I + 1i*Q; spec = fft(Acmplx); % or spectrogram etc HTH

9 días ago | 0

Answered
How do I interpolate in 5d?
Have a look at the help and documentation for interpn. HTH

10 días ago | 0

Answered
Sparse matrix from the columns of an initial matrix
Something like this might work: vals = []; idx1 = []; idx2 = []; for j = 1:n idx1 = [idx1,1:n]; c...

10 días ago | 0

Answered
Is there a way to adaptively sample 2-D surfaces ?
It is not entirely clear what your "problem situation" or "design desires" are. These might be very important for what type of s...

10 días ago | 0

Answered
Error using odearguments (line 21) When the first argument to ode23s is a function handle, the tspan argument must have at least two elements.
Your t variable will only have one component as you define it. My guess is that you want 100 elements between 0 and 1. If that's...

20 días ago | 0

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Answered
F(N) versus N plot for logistic differential equation
To solve for N you simply have to implement the ODE as a matlab-function, either as in an m-file or as an anonymous function-han...

20 días ago | 0

Answered
How can i draw Confidence interval graph for my data?...(i'm beginner)
The second graph is certainly not correct - since it is centred around zero and not around the average at each point, you have t...

20 días ago | 0

Answered
How can i make a colored 2d grid map, using a equation?
This is exactly what matlab is for, so you're thinking about the right tool. For a quick take-off I recommend you look through t...

20 días ago | 0

Answered
How can I draw a kurdistan flag in matlab?
You can add something like this: phi360 = linspace(0,2*pi,43); r = 60 + 25*(-1).^(1:43); phi3...

21 días ago | 0

Answered
how to solve error occuring in underlined part?
Run this code, but set the debug condition to stop at errors: dbstop if error Then you'll get a debug-propmt at the line where...

21 días ago | 1

Answered
How can I do the image stitching with constant overlap area?
Something like this works for a smallish toy-example: % Read image Im = imread('cameraman.tif'); % Generate some tiles with a...

23 días ago | 0

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Answered
How do I convert fractional display to decimal display ?
You might have set format to rat somewhere, perhaps in a startup.m or the like. You could get back to more normal decimal output...

24 días ago | 0

Answered
How to use interpolation instead of integrating in chunks with ODE45?
Too long code. But this is what I use for cases where I have to integrate ODEs with time-varying data for one parameter: functi...

24 días ago | 1

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Answered
Solving Complex Line Integrals
Wouldn't it be simplest to just multiply the radius of the polar representation of your unit-circle with the desired radius? g ...

24 días ago | 2

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Answered
Integration with piecewise function
Doesn't this work: C_v4 = @(T) 0.0516*T.^3.*double(T<=0.6) + .432*T.^6.7.*double(0.6<T).*double(T<1.1) + 0.468*T.^5.6.*double(1...

27 días ago | 0

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Answered
Solve a set of ODEs with given initial conditions and final conditions
To me this seems to be a problem that the shooting-method would be suited for. That will require you to solve the problem multip...

27 días ago | 1

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