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# Bjorn Gustavsson

### UIT, the Arctic University of Norway

188 total contributions since 2015

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How to draw cumulative histogram?
Simplest would be something like this: bins = [ 10 10 20 40 50 60 70 80 80 80 90 90 90 100 100 100 100 100 ]; data = [...

3 days ago | 0

Problems using ODE45 using fmincon command for least square optimisation problem
Your first function is messed up with code after the end that closes the function myObjective, try this change function chisqua...

3 days ago | 0

How can I get then angle between a line connecting two points in the plot and a vector (with only direction specified)?
Best way to go about this is to convert the "wind"-direction to a wind-vector, then use: w_angle = atan2(norm(cross(wv,b)), dot...

6 days ago | 0

how to plot a multiple 4d array on same graph
It is still a bit unclear exactly what type of data you have, but multiple 4-D data in one graph is a lot of information to dige...

6 days ago | 0

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Error encountered with decomposing time series
try to call the function with either ,...,'model','additive') % property-value pairs or with a variable model my_model = 'add...

6 days ago | 0

Finding the correlation coefficient between two images
You should be able to get the 2 x 2 correlation matrix this way: ImgCorr = corrcoef(double(Im1(:)),double(Im2(:))); From that ...

6 days ago | 0

I have a variable named T_t which is of dimension [1 20]. How do i add a normal error with a standard deviation of 1 to it?
Well, you would only get a standard deviation approximately equal to 1 if you have T_t constant for all 20 elements. If you comp...

6 days ago | 0

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Visualising Volume Object Data
You could work with surf on each radial layer and set the surface property facealpha to something transparent. Perhaps something...

8 days ago | 0

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change in a image
The only meaningful interpretation I can come up with is that you have two images of the same scene taken from a static camera (...

8 days ago | 0

use Tic Toc for function
Either scrap cellfun and loop over the elements of A, or plug tic-toc into your test-function.

8 days ago | 0

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Rename files within multiple subfolders (within multiple subfolders) to the name of the first subfolder.
Why not do something like: target_dir = fullfile('C:\Users\johan\Skrivbord\test'); source_root = fullfile('C:\Users\johan\Sk...

11 days ago | 0

Take a look at matlabFunction, it should be the function to use to convert a symbolic expression to a numerical functin. HTH

12 days ago | 0

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How to match scale of x axes in subplots, so that a given time period occupies same amount of x axis space in each subplot?
For this you can go a number of routes, one of the simlper would be to change the subplot call to: sph(r) = subplot(1,NumberOfP...

18 days ago | 0

FFT of Vibrationdata ASAP
Have a look at the spectrogram function, it should give you the signal spectra. If you really just want the fft, why not look at...

20 days ago | 0

how to split a number
Perhaps something like this: GPSval = 2829.20246; GPSdeg = sign(GPSval)*floor(abs(GPSval/100)); GPSmin = GPSval - 100*GPSdeg;...

20 days ago | 0

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Customizing MATLAB Plots and Subplots
There are contributions on the FEX that facilitate multiple y-axises. This level of figure-tuning often (for me) turns into a b...

21 days ago | 1

Rotation Matrix 3D
Maybe something like this for your coordinates: r_all = [x(:),y(:),z(:)]; r_rotated = (rotz*r_all')'; Xr = x; Yr = y; Zr = ...

21 days ago | 1

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building a non-uniform 2D grid for a specific interval
Many of matlab's functions need the input parameters to be on "plaid" grids (pcolor, surf, interp2, etc). That means that in ord...

22 days ago | 0

How to find the values of a function at any desired point given its value at some arbitrary points??
Five points worth of information is not a lot for interpolation in 3-D - plot the points and all their connections and see how u...

22 days ago | 1

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How to use slider bars to view images from a dataset?
Perhaps have a look at: Imthumb, it might not be exactly what you want, but it might be close enough for you to easily modify......

25 days ago | 0

How do I find the minimum pixel value for every point along a line automatically ?
Calculate the pixel intensities along a line-segment with interp2: x_line = 123:432; % or something like that y_line = linspac...

25 days ago | 0

How to average Bimonthly into monthly and yearly?
Tips: have a look at the dir, for function and keyword repsectively. Presumably you have some function for reading your .tif-fil...

25 days ago | 0

Why does MAtLAB returns Error using eval undefined function or variable SI.
When you get an error like "undefined function or variable SI" you do this: whos SI % Would list all variables % See if you ge...

25 days ago | 0

Elliptic Integrals in loop run too slow
First: scrap the Runge-Kutta! It is not a suitable scheme to solve equations of motion for charged particles in EM-fields. Inste...

26 days ago | 1

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i need to compare a matrix with a static table
OK, how do you need to compare the first column of X with the first column of Y? Correlation? length of difference-vector? Angle...

26 days ago | 0

Index in position 1 is invalid. Array indices must be positive integers or logical values.
OK, when you have a problem that simple (in terms of figuring out what is going on) you do this: dbstop if error Then rerun th...

26 days ago | 0

how to solve definite integrals in matlab
You have the quadgk, integral, et al. functions for numerical integration. If you have access to the symbolic toolbox you and wa...

26 days ago | 0

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Defining font size in legend does not work
>> why The bald and not excessively bald and not excessively smart hamster obeyed a terrified and not excessively terrified ham...

27 days ago | 0

How to create a plot for wave ordinary differential equation using symbolic toolbox of Matlab?
That is quite the general wave-function you have there... ...if my memmory serves me this equation have the solutions: u1 = ...

28 days ago | 0