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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 8 ans il y a | 1

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

environ 8 ans il y a | 0

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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 8 ans il y a | 1

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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...

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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))...

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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...

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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...

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According to the system you described, here the result i obtained : <</matlabcentral/answers/uploaded_files/22588/ST.jpg>> ...

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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...

environ 8 ans il y a | 1

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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)...

environ 8 ans il y a | 0

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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 : ...

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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...

environ 8 ans il y a | 0

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

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

environ 8 ans il y a | 0

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

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A résolu

inner product of two vectors
inner product of two vectors

environ 8 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...

environ 8 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.

environ 8 ans il y a

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

environ 8 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.

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Problème

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

environ 8 ans il y a | 1 | 114 solveurs

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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...

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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...

environ 8 ans il y a | 0

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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=...

environ 8 ans il y a | 0

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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...

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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...

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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 : ...

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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...

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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...

environ 8 ans il y a | 0

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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...

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