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Bjorn Gustavsson


UIT, the Arctic University of Norway

212 total contributions since 2015

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Answered
How do I create a colormap for a flat plane?
Use something like this: surf(x,y,z-1,x+0.5*y),shading flat You can use whichever linear combination of x and y to have your g...

alrededor de 18 horas ago | 0

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Answered
PLOT THE GRAPH OF VECTOR FUNCTIONS
So you want to plot a vector-function , where gives you 3-element vectors at points in 3-D space. For that you might get what...

3 días ago | 1

Answered
How do I plot interpolated grid data and original datapoint set in the same plot?
You can always simply plot all your points: plot3(Xi,Yi,Zi,'r.') Or with scatter: scatter(Xi,Yi,32,Zi,'filled') But to me th...

4 días ago | 0

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Answered
How to save figures from foor loop in separate folders
Generate your file-names with fullfile (that way you can have multiple directories in a cell-array, one for each of your wanted ...

5 días ago | 0

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Answered
How to integrate a function u^3/(exp(u)-1) in the range of [0 0.033]??.
if numerical integration is good enough: Val = integral(@(x) x.^3./(exp(x)-1),0,0.033) % for which I get: 1.1831e-05 HTH

5 días ago | 0

Answered
maximum value in scatter plot
Well that sounds like a task for histogram2, or any of the number of 2-D histogram functions available on the file exchange. The...

5 días ago | 0

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Answered
Create coordinates on a convex hull
Perhaps this function is overkill, but to me it seems as if this FEX-contribution should help: xy2sn, I don't know if it is the...

9 días ago | 0

Answered
how to draw a 3d surface of exp(x+iy)
Have a look at the dcolor submission to the file exchange. That should give you a good starting point for doing this. There ar...

10 días ago | 1

Answered
Rotate 3D quiver
Matlab uses right-handed coordinate systems (sensible), with the default convention that z is in the upward vertical direction i...

11 días ago | 0

Answered
Visualization of Euler angles
Maybe something as simple as plotting the unit-vectors before and after a rotation? That is something you can easily adapt and ...

11 días ago | 0

Answered
How do I declare and iterate a variable in an ODE driver file?
The way I read your ODE-function your Snh_in_1 is the initial value of the second component of y. If so it should be no more dif...

12 días ago | 0

Answered
Plotting a 2D crystal lattice from two primitive lattice vectors
If you do it stepwise it becomes "not too tricky": e1 = [-0.5; -sqrt(3)/2]; % Your unit e2 = [1; 0]; % vectors ...

13 días ago | 1

Answered
How to do matrix or table multiplication?
Looping seems simplest and most easily readable for humans: szI = size(IntakeTable); szE = size(ExhaustTable); resultTable = ...

15 días ago | 1

Answered
This how i want the plot to be
pcolor(x,y,I),shading flat,xlabel('x-text'),ylabel('y-text'),colorbar HTH

15 días ago | 0

Answered
How to store large data sets with different types of information?
If you're planning to run all analysis in matlab why not just store everything in a .mat-file. In this scenario just have a sit-...

17 días ago | 0

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Answered
indepvar and depvar are of inconsistent sizes with polyfitn
Yes, you send in an array [x1,x2] of size [1 x 20] and an array y of size [ 1 x 10] into polyfitn. The polyfitn version I have (...

17 días ago | 1

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Answered
Can someone answer this?
Yes most people reading these pages can. You can too. Your learning experiece depends crucialy on your effort to learn. Check th...

22 días ago | 0

Answered
Plotting 4D data
Try something like this: t = M(:,1); x = M(:,2); y = M(:,3); z = M(:,4); scatter3(x,y,z,32,t,'filled') HTH

23 días ago | 1

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Answered
Can anyone help in this error Error: The expression to the left of the equals sign is not a valid target for an assignment.
It looks like you should first check that the string generated by your strcat function call. To me it look like you generate an ...

26 días ago | 0

Answered
matrix multiplication error with too many variables in the equation .
Your first multiply are a matrix multiplication, you can achieve what you want if you make sure that C is a column-vector and t...

26 días ago | 0

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Answered
Try using or tightening upper and lower bounds on coefficients.
For arbitrary fitting tasks I personally prefer to use weighted least-square minimization using some optimization function, if ...

26 días ago | 0

Answered
How to obtain variables from a structure inside a for loop?
It seems that you read in entire data-sets into a number of numbered struct-variables (presumably s_1, s_2,..., s_25). Dont do t...

26 días ago | 0

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Answered
How to plot quiver with an input of Temperature data?
Presumably your heat-flux is just proportional to the temperature gradient (assuming constant and isotropic heat conductivity), ...

alrededor de 1 mes ago | 1

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Answered
Use conditional statements to separate elements from a single array into 2 new arrays
Are you trying to separate points that have no neighbours closer than HS_HS_threshold from those that have? If so this should d...

alrededor de 1 mes ago | 0

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Answered
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 = [...

2 meses ago | 0

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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...

2 meses ago | 0

Answered
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...

2 meses ago | 0

Answered
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...

2 meses ago | 0

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Answered
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...

2 meses ago | 0

Answered
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 ...

2 meses ago | 0

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