Community Profile # James James

Last seen: 2 dagar ago Active since 2021

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I have total of 40 years = 40*365 days = 14600 days of rainfall datas. What if I want to represent a total of 40 plots per year, not per day unit?
p = textread('Rainfall of Busan (11.5.1981 11.5.2021).txt'); dt = 1; totalL = 14600; plot(p) I have total of 40 years = 40...

5 dagar ago | 1 answer | 0

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Question

I want to apply moving average filter! could you tell me how can I do that?
p = textread('Rainfall of Busan (11.5.1981 11.5.2021).txt'); dt = 1; totalL = 14611; T = [dt:dt:dt*totalL]; freqs = linspace...

14 dagar ago | 2 answers | 1

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How can I use lowpass filter while keeping x-axis and y-axis range at log ??
How can I use lowpass filter while keeping x-axis and y-axis range at log ??

15 dagar ago | 0 answers | 0

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Question

What is this peak's meaning?
This graph is amplitude of Fourier transform of rainfalls (total of 14610 days) in frequency domain. In this case, what is this ...

20 dagar ago | 2 answers | 0

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Question

How can I plot 'period' by using fft functoin??
How can I plot 'period' by using fft functoin??

22 dagar ago | 1 answer | 0

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Which filter do I have to use?
I have rainfalls data (11/5/1981 ~ 11/5/2021) for 41 years. If I want to see anual rainfall data (January ~ December) for 41yea...

22 dagar ago | 1 answer | 0

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Question

When I import this function, there is a error when I run this codes.

25 dagar ago | 3 answers | 0

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Question

How can I make 1 by length x array of random numbers from -pi to pi ??
How can I make 1 by length x array of random numbers from -pi to pi ??

29 dagar ago | 2 answers | 0

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Question

How can I create a "Phase Scrambler" function ??
How can I create a "Phase Scrambler" function ??

30 dagar ago | 1 answer | 0

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Question

Can I ask how can I make randomphase by using code??
Can I ask how can I make randomphase by using code??

30 dagar ago | 1 answer | 0

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Question

How can I increase the number of Fourier frequencies by adding 500 zeros to the end of the 27-sample-long signal ??
fs = 250; t = 0:1/fs:0.107; L = length(t); x1 = sin(2*pi*50*t)+0.3; fftx1=fft(x1) freqHz = (0:1:length(x1)-1)*fs/L; plot(f...

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Question

I have to increase the number of Fourier frequencies by adding 500 zeros to the end of the 27-sample-long signal.
fs = 250; t = 0:1/fs:0.107; L = length(t); x1 = sin(2*pi*50*t)+0.3; fftx1=fft(x1) freqHz = (0:1:length(x1)-1)*fs/L; plot(f...

### 1

Question

I have to increase the number of Fourier frequencies by adding 500 zeros to the end of the 27-sample-long signal.
fs = 250; t = 0:1/fs:0.107; L = length(t); x1 = sin(2*pi*50*t)+0.3; fftx1=fft(x1) freqHz = (0:1:length(x1)-1)*fs/L; plot(f...

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Question

How can I calculate log10(variable) ??? there is error..
How can I calculate log10(variable) ??? there is error..

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Question

How can I get signal-to-noise ratio (SNR)??
Could you tell me how can I get signal-to-noise ratio (SNR)??

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Question

How can I call half of text by using "textread" ? (1*4096 matrix to 1*2048 matrix)
How can I call half of text by using "textread" ? (1*4096 matrix to 1*2048 matrix)

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Question

I have to use Fourier Transform without frequency range?
I have to use Fourier Transform without frequency range?

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Question

How can I get the difference between successive quantization levels (i.e. the amplitude of the least significant bit)?
How can I get the difference between successive quantization levels (i.e. the amplitude of the least significant bit)? If there...

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Question

How can I split time series in a half?
The time series is consisted of 4096 samples. I want to split it by two of 2048 samples.

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Question

The images after filtering deformation
How has the filtering (low pass filter) affected magnitude and phase?

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Question

How to trim time series?
X = rand(1,128)-0.5; fs = 1000; Ts = 1/fs; Y = lowpass(X,100,fs); plot(Y); Z = conv(X,Y); THE length of Z is 255 I wan...

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Question

How can I make low pass filter of this?
How can I make low pass filter of this? The problem: Generate a time series X of length 128 that is a sequence of 128 random n...

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Question

I want to make time series of length 128 that is a sequence of 128 random numbers pulled from a uniform distribution with a mean of zero, a range of 1(i.e. from -0.5 to 0.5)
I want to make time series of length 128 that is a sequence of 128 random numbers pulled from a uniform distribution with a mea...