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Hugo


Helsinki University

Active since 2013

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Answered
logical operation on a varable x
Is this what you are looking for? for j = 1:20 if j==1 || j==20, continue; end your_code_goes_here end This...

9 years ago | 0

Answered
How to plot 4D graph ?
You can use scatter3. To that end, you can create a matrix containing in each row the coordinates of each point and the value of...

9 years ago | 0

Answered
Plotting 4D with 3 vectors and 1 matrix
You could use "patch" since the surface will hide the interior points. You can create a matrix containing the coordinates of eac...

9 years ago | 0

Answered
Simultaneously inverting many matrices
In my experience, using cells is rather slow. Since your matrices are 2x2, then you could simple arrange them in a 3D array, wit...

9 years ago | 1

Answered
How to solve system of nonlinear equations (A-x1)*x2=B?
Notice that (A-x)*y=B (I changed the names of the variables for simplicity) can be written component-wise as (Ai-xi)*yj = Bij, w...

9 years ago | 0

Answered
How can I calculate very large matrix and store the values?
I guess one option would be to reduce the size of your data using clustering such as K-means or Gaussian mixtures, and replace a...

10 years ago | 0

Answered
int8(3) vs int(3)
At least in Matlab 2015, the function "int" is related to filters (in the filtstates package) or integration (in the symbolic pa...

10 years ago | 2

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Answered
Unexpected phase displacement in FFT of a pure sinewave.
Hi Alberto, I think your problem is due to your choice of t. Suppose that your frequency is 50Hz. If you choose t=0:.00...

10 years ago | 0

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Answered
how can I draw a line knowing just the midpoint and the angle?
You can do this midpoint=[a,b]; % This defines the midpoint. You should give a and b some value. lineangle=c; % This defines...

10 years ago | 0

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Answered
Solving an Equation using Newton-Raphson Method
Are the functions polynomials as the example you mentioned? If they are, assume that the order of the polynomial is N (in you...

10 years ago | 0

Answered
How to impove the performence of this code?
As far as I can see, there is a problem in the code. Wheneven the condition strcmp(alldata(i,1),alldatafel(j,1)) && strcmp(...

10 years ago | 1

Answered
plot two figures with same colorscale
If I understood correctly, you want the colour to vary according to the value of "z". But the problem is that plot3 takes only o...

10 years ago | 0

Answered
How do I write a function with multiple out puts and inputs with varying times?
The problem is in the equation. The constant for the charge of the capacitor is R*C. Therefore, instead of writing Vc = V*(1-...

10 years ago | 0

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Answered
How to change the color of a specific sub-bar in a 2-D bar graph
You can do that by plotting each bar separately. For example, suppose that data is a matrix of 31 x 3 and that the colors for th...

10 years ago | 1

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Answered
Taking the mean of rows in a structure array
You can do the following: nmfinal=mean(cell2mat(squeeze(struct2cell(nm.data))'))'; You might need to take some precautio...

10 years ago | 0

Answered
How to check if a 3d matrix has any 2D submatrix with non zero elements?
You can just do [any(any(a(:,:,1)>0)),any(any(a(:,:,2)>0))] or just shorter nonzero2D=@(a,k)any(any(a(:,:,k)>0)) ...

10 years ago | 0

Answered
Extracting data from lines in a plot
Just in case, you could also provide a contextual menu by doing the following hmenu=uicontextmenu; uimenu(hmenu,'Label','M...

10 years ago | 0

Answered
Extracting data from lines in a plot
Have you tried using the command text()? Suppose that the tip of one of the lines is in (a,b). Then you can just do text(a,b...

10 years ago | 0

Answered
How to compare two signal
The comparison can be done in several different ways. Suppose that X is the original signal and that XR is its reconstruction. Y...

10 years ago | 1

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Answered
Plot a 3d-plane in MATLAB??
This solution is based on patch y=-2:.01:2; z=4-y.^2; numy=length(y); % Constructing the vertices V=zeros(numy,3)...

10 years ago | 0

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Answered
Making a Square Wave Gradually
Each section is being played for one second because you are setting that in the line y(1 + timeDomain + (((k+1)/2)-1)*fs) = ...

10 years ago | 0

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Answered
multi-variable looping problem
for a=1000:100:20000 ia=floor(a/100)-9; for b=100:10:200 ib=floor(b/10)-9; for c=.2:.01:.3 ic...

11 years ago | 0

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Answered
How to find inverse of a self written function?
You can do the following sqrtllrh=fminsearch(@(sqrtllr)(cdf_func(sqrtllr.^)-h)^2,1); llrh=sqrtllrh^2; The explanation...

11 years ago | 0

Answered
Create plot with orthonormal axis
Maybe you can solve this by setting the axes property 'DataAspectRatio' to a specific value. For example: set(gca,'DataAspe...

11 years ago | 1

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Answered
Labels on the contour have too many digits
You could use [C,h]=contour(...); texth=clabel(C,h); texth is a vector that contains the handles of all labels. To ge...

11 years ago | 0

Answered
Help needed on plotting!
When you push the GUI pushbutton, you can read the labels of the columns of the data into a cell array and then create the check...

11 years ago | 0

Answered
More sophisticated code than a for loop with i is large
Please notice that in the "scatter matrix" that you showed as an example there are elements that are repeated, and the structure...

11 years ago | 0

Answered
how to read a .txt file in matlab ?
Suppose that your file is called data.txt You can load the data simply with load('data.txt'); which will create a variabl...

11 years ago | 0

Answered
patch question? image processing
How are you creating the patch? Is it only one patch? If you want the patches to be painted, you will need to create two patc...

11 years ago | 0

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Answered
How to find the reverse of a permutation vector?
Notice that p = P * (1:4)' The same for pt, i.e. pt = P' * (1:4)' For vectors p of length N, just use: pt= P' * (...

11 years ago | 0

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