Réponse apportée
How to complete the fourier Analysis using Matlab ?
Try to study and alter this example : Fs=10; t=-3:1/Fs:3; x=exp(-t); plot(t,x) N=1000; % N points for frequency computa...

environ 10 ans il y a | 1

Réponse apportée
Recover gaussian by using fft and ifft.
Try : G(end)=[]; G=(sqrt(2*pi))*G; figure; plot(t,f,'r',t,G,'g');

environ 10 ans il y a | 0

Réponse apportée
what is the meaning of? K*(i-1):end
c_t(i,1+K*(i-1):end) means selecting elements identified by *1+K(i-1)* to *end* from matrix c_t in the row *i*, generally *X(...

environ 10 ans il y a | 1

Réponse apportée
How to find spectrum envelope from wav file
Hilbert Transformation is used to obtain the envelope of signal, here is an example : The envelope is decreasing exponential...

environ 10 ans il y a | 0

Réponse apportée
Identifying wave-number sign after FFT2
The general solution for a wave travelling in the +X direction is, at point X : y(0,t)=A exp(j(wt)) y(X,t)=A exp(j(wt-KX))...

environ 10 ans il y a | 1

Réponse apportée
about High pass and low pass filter
The syntax for designing low pass filters is : b = fir1(n,Wn,'ftype',window); n is the number of coefficients, Wn is th...

environ 10 ans il y a | 0

Réponse apportée
How do I graph this plane with three points?
you can use geometric construction with meshgrid function or use patch function as follows : patch([1 1 2],[2 2 1],[3 1 0],0...

environ 10 ans il y a | 0

Réponse apportée
Wrong "step" function answer
According to the system you described, here the result i obtained : <</matlabcentral/answers/uploaded_files/22588/ST.jpg>> ...

environ 10 ans il y a | 0

Réponse apportée
Plotting contours of a probability density
You have to use two dimensional arrays of x and z to produce two dimensional pdf, try : [x,z]=meshgrid(-6:0.01:6); r=sqrt...

plus de 10 ans il y a | 1

Réponse apportée
Plotting piece-wise functions with absolute value????
The algorithm you wrote is almost correct, inside the if conditions you need to use x(k), not x : x = linspace (-10,10,100)...

plus de 10 ans il y a | 0

Réponse apportée
Stand alone C file
If you mean reading a file with C, then you need to use pointer as the following, with apriori knowledge of array dimensions : ...

plus de 10 ans il y a | 0

Réponse apportée
Problem in computing the curl of 2D velocity vector field
Generally, the input velocity matrices may contain NaNs, try : sum(isnan(UU(:))); % must be zero if there is no NaN, same fo...

plus de 10 ans il y a | 0

Réponse apportée
matlab triple integral conical gravity
I think that working with symbolic variables will not permit the transformation of integral expressions to numeric type, however...

plus de 10 ans il y a | 0

Réponse apportée
Correlation between two images ..
if you mean correlation coefficient, you can program manually the function or use corr2 : corr2(A,B); % returns a scalar...

plus de 10 ans il y a | 0

Réponse apportée
I can I duplicate raws of variables?
try this standard method a=[1:3]; b=[]; for n=1:6 b=[b a]; end

plus de 10 ans il y a | 0

| A accepté

A résolu

inner product of two vectors
inner product of two vectors

plus de 10 ans il y a

A résolu

Nearest Numbers
Given a row vector of numbers, find the indices of the two nearest numbers. Examples: [index1 index2] = nearestNumbers([2 5 3...

plus de 10 ans il y a

A résolu

Create a row array using double colon operator
Create a row array from 9 to 1, using the double colon operator.

plus de 10 ans il y a

A résolu

Circle area using pi
Given a circle's radius, compute the circle's area. Use the built-in mathematical constant pi.

plus de 10 ans il y a

A résolu

Sum all integers from 1 to 2^n
Given the number x, y must be the summation of all integers from 1 to 2^x. For instance if x=2 then y must be 1+2+3+4=10.

plus de 10 ans il y a

Problème

Test if a matrix is symmetric
Write a logical function that returns 1 if the input matrix is symmetric and 0 otherwise.

plus de 10 ans il y a | 1 | 124 solveurs

Réponse apportée
How to apply velocity + acceleration to a position?
@Roger gave the solution (Vx,Vy) . try to write a feedback of this solution. t=0:100e-3:20; V0x=1000; Alpha=0.0004; Beta...

plus de 10 ans il y a | 0

| A accepté

Réponse apportée
SVD & EVD of a Symmetric Matrix
Floating points problems occur as mentioned by @Jhon, you can verify if your matrix M is symmetric or not : norm(M-M') % mus...

plus de 10 ans il y a | 0

Réponse apportée
How to apply velocity + acceleration to a position?
You can verify this primary solution theoretically : t=0:100e-3:20; V0x=1000; Alpha=0.0004; Beta=0.25; Vx=...

plus de 10 ans il y a | 0

Réponse apportée
Time series syntax question
ts(i,1) means performing calculation of the elements of first column of matrix ts, ts(i,2) means the ith element on the second c...

plus de 10 ans il y a | 0

Réponse apportée
I have a question about RESAMPLE
This is an interesting remark, however in Documentation, it was mentioned that re-sampling has side effect because of filterin...

plus de 10 ans il y a | 0

| A accepté

Réponse apportée
I have a sine function y = a*sin(bx+c)+d and I have 4 points on the function: P1(0.835,0.720) P2(1.498,0.589) P3(2.866,0.236) P4(3.299,0.649)?
hi, if you have Math symbolic ToolBox, you can use the function solve, the output is a structure with symbolic variables : ...

plus de 10 ans il y a | 0

| A accepté

Réponse apportée
Integrating with trapz and calculate the error
The first remark is that names of built in functions must not be used as variables ( trapz in this case ), second remark is *int...

plus de 10 ans il y a | 0

Réponse apportée
Computing first derivative--image processing
In general diff(X,n) of N by 1 vector returns an N-n by 1 vector, second derivative is diff(X,2), using gradient is better beca...

plus de 10 ans il y a | 0

Réponse apportée
Using loglog for plotting a logarithmic graph
You have to use element wise operator ( . before any operator sign) : x = 10:19700; y=96818.90647.*sqrt(55327.8644...

plus de 10 ans il y a | 0

| A accepté