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Helsinki University

自 2013 起处于活动状态

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已回答
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 前 | 0

已回答
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 前 | 0

已回答
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 前 | 0

已回答
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 前 | 1

已回答
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 前 | 0

已回答
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...

9 years 前 | 0

已回答
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...

9 years 前 | 2

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已回答
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...

9 years 前 | 0

| 已接受

已回答
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...

9 years 前 | 0

| 已接受

已回答
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...

9 years 前 | 0

已回答
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 前 | 1

已回答
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 前 | 0

已回答
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 前 | 0

| 已接受

已回答
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 前 | 1

| 已接受

已回答
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 前 | 0

已回答
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 前 | 0

已回答
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 前 | 0

已回答
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 前 | 0

已回答
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 前 | 1

| 已接受

已回答
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 前 | 0

| 已接受

已回答
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 前 | 0

| 已接受

已回答
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...

10 years 前 | 0

| 已接受

已回答
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...

10 years 前 | 0

已回答
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...

10 years 前 | 1

| 已接受

已回答
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 前 | 0

已回答
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 前 | 0

已回答
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 前 | 0

已回答
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 前 | 0

已回答
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 前 | 0

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已回答
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 前 | 0

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