已回答

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...

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...

8 years 前 | 1

已回答

Recover gaussian by using fft and ifft.

Try : G(end)=[]; G=(sqrt(2*pi))*G; figure; plot(t,f,'r',t,G,'g');

Recover gaussian by using fft and ifft.

Try : G(end)=[]; G=(sqrt(2*pi))*G; figure; plot(t,f,'r',t,G,'g');

8 years 前 | 0

已回答

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(...

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(...

8 years 前 | 1

已回答

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...

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...

8 years 前 | 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))...

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))...

8 years 前 | 1

已回答

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...

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...

8 years 前 | 0

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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...

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...

8 years 前 | 0

已回答

Wrong "step" function answer

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

Wrong "step" function answer

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

8 years 前 | 0

已回答

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...

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...

8 years 前 | 1

已回答

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)...

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)...

8 years 前 | 0

已回答

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 : ...

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 : ...

8 years 前 | 0

已回答

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...

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...

8 years 前 | 0

已回答

matlab triple integral conical gravity

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

matlab triple integral conical gravity

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

8 years 前 | 0

已回答

Correlation between two images ..

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

Correlation between two images ..

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

8 years 前 | 0

已回答

I can I duplicate raws of variables?

try this standard method a=[1:3]; b=[]; for n=1:6 b=[b a]; end

I can I duplicate raws of variables?

try this standard method a=[1:3]; b=[]; for n=1:6 b=[b a]; end

8 years 前 | 0

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已解决

Nearest Numbers

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

8 years 前

已解决

Create a row array using double colon operator

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

8 years 前

已解决

Circle area using pi

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

8 years 前

已解决

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.

8 years 前

问题

Test if a matrix is symmetric

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

8 years 前 | 1 | 116 个解题者

已回答

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...

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...

8 years 前 | 0

| 已接受

已回答

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...

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...

8 years 前 | 0

已回答

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=...

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=...

8 years 前 | 0

已回答

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...

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...

8 years 前 | 0

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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...

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...

8 years 前 | 0

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已回答

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 : ...

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 : ...

8 years 前 | 0

| 已接受

已回答

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...

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...

8 years 前 | 0

已回答

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...

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...

8 years 前 | 0

已回答

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...

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...

8 years 前 | 0

| 已接受