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# Star Strider

##### Last seen: Today
13,784 2012 이후 총 참여 횟수

Hic sunt dracones!

PROFESSIONAL: Physician (M.D.): Diplomate of the American Board of Internal Medicine; M.Sc. Biomedical Engineering: Instrumentation, Signal Processing, Control, System Identification, Parameter Estimation

NON-PROFESSIONAL: Amateur Extra Class Amateur Radio Operator; Private Pilot, Airplane Single Engine Land, Instrument Rating Airplane; Gamer

NOTE: I do not respond to emails or personal messages, unless they are about my File Exchange contributions.

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Help me undersandand Frequency Vector and index vector in fourier transform
That is my code, so I will do my best to explain it. The frequency vector ‘Fv’ here defines the frequencies for a one-sided F...

약 7시간 전 | 0

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Why are the lines not showing up on my graphs?
You are only plotting one point (that being the last point) and it is not possible to plot lines with only one point. Try thi...

약 8시간 전 | 0

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save a fprintf as text data
use the fopen function to create a file ID and fclose to close it. Include the fopen output as the first argument to fprintf to...

약 14시간 전 | 0

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how to plot line with dots?
There are several options: x = 1:10; y = rand(1,10); subplot(3,1,1) plot(x, y, '-ok') title('Circles and Lines') subplo...

약 16시간 전 | 0

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how can I present histogram as line plot
Set DisplayStyle to stairs.

약 16시간 전 | 0

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how to model kinetic reaction system
There are several examples on fitting differential equations to data in Answers. See: ODE and Data fitting and Parameter Estima...

약 18시간 전 | 0

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Applying sgolay filter (derivatives) on data with variable Fs
Every signal processing technique that I am aware of (except the newly-introduced nufft function) requires uniformly-sampled sig...

약 23시간 전 | 0

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System of nonliner equations with symbolic variables
The code needs a few adjustments: syms lamT lamZ eqT = 10*lamT^13*lamZ^13 - 10/lamT^13 - 10*lamT^2*lamZ; eqZ = 10*lamT^13*l...

1일 전 | 0

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Is it possible to save a workspace when a program is paused without it ending the program?
Using the save function at appropriate places in the code will not cause the code to crash. See: How to save data from Geneti...

1일 전 | 0

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'LSQCURVEFIT requires all values returned by functions to be of data type double' error
It took a bit of effort to figure out what you are doing, and get your code to run correctly, although it still needs for you to...

2일 전 | 0

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How to plot a symbolic equation
Using piecewise (R2016b and later versions) may be an option.

2일 전 | 1

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summation of 2 Sine waves
It does show a straight line at zero. Look at the magnitude of the y-axis (±2E-15), and you will see that it is essentially plo...

2일 전 | 0

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How can I create this image?
Try this: [X1,Y1,Z1] = cylinder; X2 = bsxfun(@times, X1, [1.2; 0]); Y2 = bsxfun(@times, Y1, [1.2; 0]); figure Ax = gca; ...

3일 전 | 0

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Sampling Audio at 11025 sample/sec in MATLAB
See: Record and Play Audio for a full description of the process. Note that SampleRate defines the sampling frequency.

3일 전 | 0

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I'm unable to derive a function with decimals
Use the vpa function: vpa(diff(Y)) .

3일 전 | 0

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Find missing dates from a file
Try this: fidi = fopen('Dates.txt'); D = textscan(fidi, '%{dd/MM/yyyy}D') fclose(fidi); AllDates = (D{1}(1):caldays(1):D{1}...

4일 전 | 0

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Help with some fft problems, can't come up with a better title
You need to force the index arguments to be integers. One option: plot(Y(1:fix(length(Y)/2))); There are others, dependin...

4일 전 | 0

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How can I change the radius of the spiral so it varies along the length from 0 to 1?
Change ‘x’ and ‘z’ to: x=cos(y/100*10*pi).*(y/100); z=sin(y/100*10*pi).*(y/100); so the full code siis now: y=0:0.5:100; ...

4일 전 | 0

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How to get spectrogram of an array in MATLAB?
The documentation states that the input signal is ‘specified as a row or column vector’, so you would need to loop through each ...

4일 전 | 0

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Why can't I automatically get an integer from this simple function?
You have encountered floating-point approximation error. See Floating-Point Numbers for an extended discussion. The differen...

4일 전 | 0

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How can I find integral of a 3-D mesh field?
See if using trapz on one or both dimensions of your matrix will do what you want.

4일 전 | 0

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Executing a multiple plot graph
Change to: plot(x, -1.2e8*a/25*x + 1.2e8*a) and it should work.

4일 전 | 0

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Troubles with Butterworth Bandpass filter
My expertise in this area stops with the filters and thier implementations. An appropriate time vector: Fs = 1000; L = num...

5일 전 | 0

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i want to solve this equation
See if this does what you want: a = sum((x - mean(x)).*y) / sum((x - mean(x)).^2); .

5일 전 | 0

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Area in 3-D temperature plot
Apparently, the contour3 call plots temperature contours as a function of longitude and depth. You can specify the levels at wh...

5일 전 | 0

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Why is there an offset in my butterworth and cheby filters when they have the same values?
There is not really much difference. It is necessary to get the matching frequency vector (‘wh’ and ‘wc’ here) from the freqs f...

5일 전 | 0

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Fast Fourier Transform with discrete data
I suspect the first column of ‘data’ is a time vector and the second column is the signal vector. If that is correct, try thi...

5일 전 | 0

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how to use lsim
The lsim function will work to get the step response of a system, however the step function is particularly designed to do this....

6일 전 | 1

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Butterworth filter: Number of coefficients?
The first argument to butter is the filter order, and the number of coefficients in the transfer function vectors will be 1 les...

6일 전 | 0

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How to I plot Laplace transfer function characteristics using the symbolic toolbox?
Here, ‘s’ needs to be complex: syms s; H = 1/(0.001*1j*s+1); figure; fplot(20*log10(abs(H)), [0 100000]); % set(gca, 'XScal...

6일 전 | 1

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