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representation of array
Like this example? >> T = 0 : 0.01 : 0.05 T = 0 0.0100 0.0200 0.0300 0.0400 0.0500 >> ...

13 years 前 | 0

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Can't sort this code
You define fnj as MxN, but in your for loop you are assigning values to fnj(j,n) where: j = 1 : N and n = 1 : M ...

13 years 前 | 0

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FFT function code from YouTube not working
Did you mean: X = X(1:cutOff);

13 years 前 | 1

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How do I draw a solid cylinder ?/
There probably exists a better way to do this, but: D = 5; % Diameter H = 10; % Height A = 360; % Angles to plot ...

13 years 前 | 0

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Help with code needed - sampling
One change to make: An <= xj <= (An+1) should be split up (An <= xj) && (xj <= (An+1))

13 years 前 | 1

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popupmenu in GUI
temp_cellstr = {'choice 1';'choice 2';'choice 3'}; set(handles.your_popup_name,'String',temp_cellstr); Or you can open the...

13 years 前 | 1

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System time Matlab
see also "clock"

13 years 前 | 1

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How to rename filenames quickly?
Using a trick I recently learned, after you have used the info in Sean's link to determine and store the names of the files in a...

13 years 前 | 0

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fft/ifft transform of 2d matrix
If you want an idea of what is going on behind the scenes of fft2, then you can check out my answer here: <http://www.mathwor...

13 years 前 | 0

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code of trace path
In this version, there is a check that will modify the possible path directions based on whether the row/col it can move to alre...

13 years 前 | 0

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Writing program to evaluate a polynomial at point x=c
reverse your a, a = [an ... a1 a0]

13 years 前 | 0

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code of trace path
Not entirely clear on an acceptable result, but if this is an example of an acceptable result: 1 1 1 0 0 1 0 0 ...

13 years 前 | 0

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Searching for specific maxima
Next idea, instead of envelope of Freq we replace any negative (or really small) frequencies with linear interpolation of positi...

13 years 前 | 0

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font size setting
Look for "Preferences" > "Fonts" in your menu

13 years 前 | 1

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Sort cell strings according to specific subsets of those cell strings
Here is the clunky version I have been using: numFiles = numel(filename); sortcell = {''}; sortind = zeros(n...

13 years 前 | 0

提问

Sort cell strings according to specific subsets of those cell strings
Let's say I have a cell string with values: filename = {'2009.272.17.57.23.8445.AZ.SMER..BHE.R.SAC';... ...

13 years 前 | 3 个回答 | 0

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detect nth character in a string
If you want the result to also be a string, then: b = a(2:3); If you want the result to be a number, then: b = str2...

13 years 前 | 1

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Inequality problem
You have to split them up... instead of: A < X < B you have to do: (A < X) && (X < B) Incidentally, make sure yo...

13 years 前 | 0

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Least square polynomial fit
Check out "polyfit", "polyval" and "max" - polyfit will give you the polynomial coefficients for an n-order polynomial - p...

13 years 前 | 0

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fft error: Not enough input arguments.
When you run the function as "homFreq" (with no input arguments) from the command line (or from the editor) you aren't defining ...

13 years 前 | 0

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Fourier-Frequency analyse
You need to make a few changes: If, dt = 0.0001; t = 0:dt:(0.05-dt); N = length(t); y_time = square(5*pi*50*t); Th...

13 years 前 | 0

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Searching for specific maxima
Similar to andrei: A = [1 2 1 2 3 2 3 4 122 120 3 4 5 3 51 4 2] [pks,locs] = findpeaks(A) maxpks = max(pks); threshold =...

13 years 前 | 0

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Find what toolboxes a script uses
Also, see this answer: <http://www.mathworks.com/matlabcentral/answers/25958-how-to-list-functions-toolboxes-required-by-a-progr...

13 years 前 | 0

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FFT of a signal based on simulation data
A couple of helpful tips: ti = 0 : 0.01 : 39; Will do the same thing as: ti = []; j=1; for i=1:0.01:40; ti(j) = i-1; j=j+...

13 years 前 | 0

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FFT of a signal based on simulation data
I usually do: df = fs / N; Nyq = fs / 2; f = -Nyq : df : Nyq-df; plot(f , abs(fftshift(Y))); But that looks like the same th...

13 years 前 | 0

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How to compute the fourier transform for a signal u(t) over frequency band [-10,10]?
Say you have the following: N = 1024; % Number of samples dt = 0.01; % Seconds per sample u_time = randn(1,N); Then, you wo...

13 years 前 | 1

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Pseudo Inverse Matrix
If you have the following situation: G*m = d where, G = (MxN) % Known m = (NxP) % Unknown d = (MxP) % Known Then to find...

13 years 前 | 0

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Finding the velocity from displacement
This is a function I wrote to convert seismograms from one domain to another: function dataout = iomega(datain, dt, datain...

13 years 前 | 4

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Chirp generation
As Walter says, this will not give you a true chirp signal. If you are aware of this and would still like to have a pseudo-chirp...

13 years 前 | 1

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Counting zeros
I know you don't need to find the roots explicitly, but this will work: p = [1 -6 -72 -27]; % polynomial coeffs for f(x) = x^...

13 years 前 | 0