# Hugo

### Helsinki University

Actif depuis 2013

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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...

presque 9 ans il y a | 0

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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...

presque 9 ans il y a | 0

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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...

presque 9 ans il y a | 0

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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...

presque 9 ans il y a | 1

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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...

environ 9 ans il y a | 0

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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...

environ 9 ans il y a | 0

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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...

environ 9 ans il y a | 2

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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...

environ 9 ans il y a | 0

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zoom_wheel(hfig,options)
Zoom in and out using the wheel in a rather practical manner

environ 9 ans il y a | 1 téléchargement |

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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...

environ 9 ans il y a | 0

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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...

environ 9 ans il y a | 0

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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(...

plus de 9 ans il y a | 1

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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...

plus de 9 ans il y a | 0

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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-...

plus de 9 ans il y a | 0

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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...

presque 10 ans il y a | 1

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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...

presque 10 ans il y a | 0

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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)) ...

environ 10 ans il y a | 0

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Extracting data from lines in a plot

environ 10 ans il y a | 0

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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...

environ 10 ans il y a | 0

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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...

environ 10 ans il y a | 1

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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)...

environ 10 ans il y a | 0

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

environ 10 ans il y a | 0

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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...

environ 10 ans il y a | 0

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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...

environ 10 ans il y a | 0

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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...

environ 10 ans il y a | 1

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A soumis

3D Gaussian ellipses constant probability curves
Construct data points of ellipsoids depicting contour curves of 3-dimensional Gaussian distributions

environ 10 ans il y a | 1 téléchargement |

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Gaussian ellipses constant probability curves
Construct data points of ellipses representing contour curves of bivariate Gaussian distributions.

environ 10 ans il y a | 3 téléchargements |

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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...

presque 11 ans il y a | 0

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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...

presque 11 ans il y a | 0

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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...

presque 11 ans il y a | 0