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Last seen: 4 years ago |  Active since 2017

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FFT frequency shift during downsampling
I have a signal at 1000Hz and I am calculating FFT of the signal. I see it's first order contents at 11Hz. However when I downsa...

4 years ago | 0 answers | 0

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answers

Question


Sum of enumerated data types
I have an array of 50 elements all of which are enum types. (say FALSE(0), TRUE(1), UNAVAILABLE(2)). I would like to calculate t...

5 years ago | 1 answer | 0

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answer

Question


Find out if X out of Y elements of an array are true
I have an array of 5 elements. The array is updated at any index (1,2,3,4,5) in each simulation time to a value TRUE or FALSE. I...

5 years ago | 2 answers | 0

2

answers

Question


Normalizing a complex number
I have a complex matrix with real numbers in column 1 and imaginary numbers in column 2. I used this approach, but still did not...

5 years ago | 2 answers | 0

2

answers

Question


FFT outputs differ between matlab fft function and hand coded FFT
Hello, I am working on writing a C-code that does the same function as the matlab built-in FFT function. For the implementation...

5 years ago | 0 answers | 0

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answers

Question


Calculate the natural frequency of unsprung mass from FFT/spectrogram
I have a 10ms sampled data of vehicle speeds. I have calculated the FFT of the signal in 10 second windows and have the single s...

5 years ago | 0 answers | 0

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answers

Question


Generate sine wave with varying phase
Hello, I would like to have 2 sinewaves, the second sine wave should be in phase with the first for half of its total time and m...

5 years ago | 1 answer | 1

1

answer

Question


Clock synchronization between 2 controllers
I am reading data from a microcontroller at 10ms sampling time. The problem is that the data is not exactly 10ms due to the drif...

5 years ago | 0 answers | 0

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answers

Question


Problem in Windowed FFT output
<</matlabcentral/answers/uploaded_files/127127/FFT.jpg>> I have taken a windowed FFT (5 second interval) of a 30 second signa...

5 years ago | 0 answers | 0

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answers

Question


Matlab script to load a .mat file based on entry in dialog box
I have a .m script that receives a number of user inputs. One of the styles is a listbox and the output of the list box is store...

6 years ago | 1 answer | 0

1

answer

Question


loop implementation with two conditions
I have a time series data sampled at 100 ms. I would like to pick samples every 1 sec or when difference between 2 consecutive s...

6 years ago | 1 answer | 0

1

answer

Question


Array concatenation based on condition.
I have an array that has 100000+ values. every 3000th sample to a new array based on a condition. 1. I should compare every 3...

6 years ago | 0 answers | 0

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answers

Answered
Increment loop index based on a condition
Now I have an added condition to this problem : 1. I should compare every 3000th value and see if it differs from the previous ...

6 years ago | 0

Question


Increment loop index based on a condition
I have an array that has 100000+ values. every 3000th sample to a new array based on a condition. 1. I should compare every 3...

6 years ago | 2 answers | 0

2

answers

Question


Determine the cut off frequency of a low pass filter from an array of values
I have a number of sensor data collected in arrays. I would like to determine the cut off frequency of each array of data. Right...

6 years ago | 0 answers | 1

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answers

Answered
Find an array element's index
What I have currently is this : temp = zeros(1,length(x)); min_val = zeros(1,length(x)); index = zeros(1,length(x)...

6 years ago | 0

Question


Find an array element's index
I have a first array that has about 5000 values. I have a second array that is (first array - (0.3)*(first array(1))); For every...

6 years ago | 2 answers | 0

2

answers

Question


FFT of sensor data
Hello everyone! I am a beginner in Signal processing. I have a time series plot of sensor data that has 200000 values. I need...

7 years ago | 2 answers | 0

2

answers

Question


Exponential growth/decay point detection in a time series plot
I am working on a set of time series data. I am trying to locate the point at which an exponential growth begins in the time ser...

7 years ago | 1 answer | 0

1

answer