Answered
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...

ungefär 10 år ago | 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');

ungefär 10 år ago | 0

Answered
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(...

ungefär 10 år ago | 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...

ungefär 10 år ago | 0

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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))...

ungefär 10 år ago | 1

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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...

ungefär 10 år ago | 0

Answered
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...

mer än 10 år ago | 0

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

mer än 10 år ago | 0

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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...

mer än 10 år ago | 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)...

mer än 10 år ago | 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 : ...

mer än 10 år ago | 0

Answered
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...

mer än 10 år ago | 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...

mer än 10 år ago | 0

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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...

mer än 10 år ago | 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

mer än 10 år ago | 0

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Solved

inner product of two vectors
inner product of two vectors

mer än 10 år ago

Solved

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

mer än 10 år ago

Solved

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

mer än 10 år ago

Solved

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

mer än 10 år ago

Solved

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.

mer än 10 år ago

Problem

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

mer än 10 år ago | 1 | 124 solvers

Answered
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...

mer än 10 år ago | 0

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Answered
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...

mer än 10 år ago | 0

Answered
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=...

mer än 10 år ago | 0

Answered
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...

mer än 10 år ago | 0

Answered
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...

mer än 10 år ago | 0

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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 : ...

mer än 10 år ago | 0

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Answered
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...

mer än 10 år ago | 0

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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...

mer än 10 år ago | 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...

mer än 10 år ago | 0

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