Answered
How can I use lorentzian norm in 2D gray scale image segmentation?
rasha Lorentizian metric requires 4 dimensions x,y,z,t, but here for image processing the matrix is 2D so then where there is...
How can I use lorentzian norm in 2D gray scale image segmentation?
rasha Lorentizian metric requires 4 dimensions x,y,z,t, but here for image processing the matrix is 2D so then where there is...
13 years ago | 0
| accepted
Answered
finding the dominant frequency via fourier transform
Your data is sampled with Fs=10 Hz, Your Frequency spectrum is : Fs=10; N=length(x); fx=fft(x)/N; f=(0:N-1)*Fs/N; fi...
finding the dominant frequency via fourier transform
Your data is sampled with Fs=10 Hz, Your Frequency spectrum is : Fs=10; N=length(x); fx=fft(x)/N; f=(0:N-1)*Fs/N; fi...
13 years ago | 0
| accepted
Answered
Writing a function that stops after three odd numbers have been found in a list.
try to enhance this version : function Y=MyMod(X) % List X N=length(X); Y=zeros(N,1); % solution ctr=1; % Counter ...
Writing a function that stops after three odd numbers have been found in a list.
try to enhance this version : function Y=MyMod(X) % List X N=length(X); Y=zeros(N,1); % solution ctr=1; % Counter ...
13 years ago | 0
| accepted
Answered
How to separate noise from signal?
Try Kalman Filter : <http://www.mathworks.com/matlabcentral/fileexchange/38353-1d-standard-kalman-filter-simulink-model-progr...
How to separate noise from signal?
Try Kalman Filter : <http://www.mathworks.com/matlabcentral/fileexchange/38353-1d-standard-kalman-filter-simulink-model-progr...
13 years ago | 0
Answered
how do i write a function that splits a 16x1 matrix into a 4x4 matrix
Use reshape as mentioned by @Image Analyst , or use standard method : function Y=split16144(X) Y=zeros(4,4); ctr=1; fo...
how do i write a function that splits a 16x1 matrix into a 4x4 matrix
Use reshape as mentioned by @Image Analyst , or use standard method : function Y=split16144(X) Y=zeros(4,4); ctr=1; fo...
13 years ago | 0
Submitted
PSD (Power Spectral Density), and Amplitude Spectrum with adjusted FFT
FFT computes PSD and one sided amplitude spectrum Y[f] of 1d signal
13 years ago | 6188 downloads |
Answered
Help with Plotting a Pulse Train as function of time in MATLAB
Start from this version : f0=1e+6; % 1MHz Fs=3e+6; Tf=0.001; % 1 millisecond t=0:1/Fs:Tf-1/Fs; td=0.1; % duty cycle ...
Help with Plotting a Pulse Train as function of time in MATLAB
Start from this version : f0=1e+6; % 1MHz Fs=3e+6; Tf=0.001; % 1 millisecond t=0:1/Fs:Tf-1/Fs; td=0.1; % duty cycle ...
13 years ago | 0
Answered
calculating rmse between observations and estimates of different size
You can padd the small vector with zero or Interpolate as mentioned by @Thomas : % Given your vectors r1 r2 r1=randn(315...
calculating rmse between observations and estimates of different size
You can padd the small vector with zero or Interpolate as mentioned by @Thomas : % Given your vectors r1 r2 r1=randn(315...
13 years ago | 0
Answered
How to save a figure with inside an image and a plot ?
Axel, By using the format TIFF, you can control the resolution horizontally and vertically , that is also available for other...
How to save a figure with inside an image and a plot ?
Axel, By using the format TIFF, you can control the resolution horizontally and vertically , that is also available for other...
13 years ago | 0
Answered
how to find similarity between two imges or two audio signals using matlab?
there are many statistical tools that can be used for this purpose , ( rmse, Correlation, cross spectral density, ...etc), try t...
how to find similarity between two imges or two audio signals using matlab?
there are many statistical tools that can be used for this purpose , ( rmse, Correlation, cross spectral density, ...etc), try t...
13 years ago | 0
Answered
To desing low pass FIR filter analysis and application
Generally the returned values from filter design function are two vector a and b that represent the nominator and denominator of...
To desing low pass FIR filter analysis and application
Generally the returned values from filter design function are two vector a and b that represent the nominator and denominator of...
13 years ago | 0
| accepted
Answered
How to draw a weighted graph G=(V,E)
is the original graph a sparse matrix? generally you can delete the values using this example : % given a vector( or matr...
How to draw a weighted graph G=(V,E)
is the original graph a sparse matrix? generally you can delete the values using this example : % given a vector( or matr...
13 years ago | 0
Answered
how to color a surface?
I think your data have many isosamples, that makes the colormap concentrated because of the interpolation,add this command befor...
how to color a surface?
I think your data have many isosamples, that makes the colormap concentrated because of the interpolation,add this command befor...
13 years ago | 0
Answered
Area under autocorrelation function.
hi, You evaluate the integral of the auto-correlation function with respect to your boundaries , here is an example : y=s...
Area under autocorrelation function.
hi, You evaluate the integral of the auto-correlation function with respect to your boundaries , here is an example : y=s...
13 years ago | 0
Answered
I created an 3D sinusoidal surface. And want to add a normally distributed random noise of zero mean and 0.03mm standard deviation. But it said error on the line with*. Subscripted assignment dimension mismatch. could someone help me check it please
Jianxiang, As you use x,y loops , at each iteration the CPU computes only one scalar while you used the function *normrnd* of...
I created an 3D sinusoidal surface. And want to add a normally distributed random noise of zero mean and 0.03mm standard deviation. But it said error on the line with*. Subscripted assignment dimension mismatch. could someone help me check it please
Jianxiang, As you use x,y loops , at each iteration the CPU computes only one scalar while you used the function *normrnd* of...
13 years ago | 0
Answered
error reading Philips dicom images
hi pom, You mean that your samples are named : 'IM_0022.dcm1, 'IM_0022.dcm2, 'IM_0022.dcm3 ? If this is the case then you ...
error reading Philips dicom images
hi pom, You mean that your samples are named : 'IM_0022.dcm1, 'IM_0022.dcm2, 'IM_0022.dcm3 ? If this is the case then you ...
13 years ago | 0
Answered
another FFT amplitude question
Try my submission, : <http://www.mathworks.com/matlabcentral/fileexchange/40002-psd-power-spectral-density-and-amplitude-...
another FFT amplitude question
Try my submission, : <http://www.mathworks.com/matlabcentral/fileexchange/40002-psd-power-spectral-density-and-amplitude-...
13 years ago | 0
Submitted
Parseval's Theorem : 1D,2D and 3D functions
Computing the total energy of waveform in time & frequency domains.
13 years ago | 1032 downloads |
Answered
I wrote a code for determining the volume need for each stage of a rocket
Steven, The error i can see is that the volume is negative, because you substract the height from 138 & 219.5 while its the re...
I wrote a code for determining the volume need for each stage of a rocket
Steven, The error i can see is that the volume is negative, because you substract the height from 138 & 219.5 while its the re...
13 years ago | 0
Answered
Gaussian High Pass Filter
hi lina, I tried your program and it works fine, replace the first command with : a=im2double(imread('circuit.tif')); ...
Gaussian High Pass Filter
hi lina, I tried your program and it works fine, replace the first command with : a=im2double(imread('circuit.tif')); ...
13 years ago | 1
| accepted
Answered
Help: How to plot like this ?
contour(your_data) % your data is M*N matrix colormap gray
Help: How to plot like this ?
contour(your_data) % your data is M*N matrix colormap gray
13 years ago | 0
Answered
Urgent: How do I perform FFT on a time signal
hi, given your signal X, Fs=2e+4; Resolution=512; Ts=1/Fs; N=4e+4; T=N*Ts; Fx=abs(fft(X,Resolution)); Frequency...
Urgent: How do I perform FFT on a time signal
hi, given your signal X, Fs=2e+4; Resolution=512; Ts=1/Fs; N=4e+4; T=N*Ts; Fx=abs(fft(X,Resolution)); Frequency...
13 years ago | 0
Answered
Replacing a for loop with a while loop?
hi, Using while, you need to increment the variable manually, : y=1; time=1; while time<6 y=y*time; time=time+1;...
Replacing a for loop with a while loop?
hi, Using while, you need to increment the variable manually, : y=1; time=1; while time<6 y=y*time; time=time+1;...
13 years ago | 1
Answered
How can I plot this vector
hi, The data must also contains time data where a second vector or an <N by-2> matrix, You can use plot function, *plot(data...
How can I plot this vector
hi, The data must also contains time data where a second vector or an <N by-2> matrix, You can use plot function, *plot(data...
13 years ago | 0
| accepted
Answered
How do I perform envelop on a time signal
hi,you have Analog methods : 1. Frequency Modulation : Fs = 8000; % Sampling rate of signal Fc = 3000; % Carrier freque...
How do I perform envelop on a time signal
hi,you have Analog methods : 1. Frequency Modulation : Fs = 8000; % Sampling rate of signal Fc = 3000; % Carrier freque...
13 years ago | 0
Answered
How to match matrix dimensions?
hi Jackie, The mistake is obvious, its the last component 1, replace it with ones(1,length(X))
How to match matrix dimensions?
hi Jackie, The mistake is obvious, its the last component 1, replace it with ones(1,length(X))
13 years ago | 0
| accepted
Answered
what is the support of the rgb2gray function?
hi, There is not big difference between the different formulas, try your own way using the weight *0.3333* : I=imread('a...
what is the support of the rgb2gray function?
hi, There is not big difference between the different formulas, try your own way using the weight *0.3333* : I=imread('a...
13 years ago | 0
Answered
what is the support of the rgb2gray function?
hi, Here is paper that describes a derivation : <http://www.cis.rit.edu/mcsl/research/broadbent/CIE1931_RGB.pdf>
what is the support of the rgb2gray function?
hi, Here is paper that describes a derivation : <http://www.cis.rit.edu/mcsl/research/broadbent/CIE1931_RGB.pdf>
13 years ago | 1
Answered
Covariance Matrix by Simulation
hi S. David What you described is correct, and as *Wayne King* said, one needs to to perform N times and averages them to get...
Covariance Matrix by Simulation
hi S. David What you described is correct, and as *Wayne King* said, one needs to to perform N times and averages them to get...
13 years ago | 1
Answered
what is the sampling frequency in wavelet method?
hi, you have N=300 points for duration t=30 secs , then the samle rate is *f=N/t=10Hz* or you can perform this way : T...
what is the sampling frequency in wavelet method?
hi, you have N=300 points for duration t=30 secs , then the samle rate is *f=N/t=10Hz* or you can perform this way : T...
13 years ago | 1
| accepted