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Manolis Michailidis


Alexander Technological Institute of Thessaloniki

Active since 2015

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Answered
Error in testing neural
i just found my error, the test matrix should have the same dimensions as the train

6 years ago | 0

Question


Error in testing neural
Hello, i have trained my neural with matrix X [40 30] the Target is [3 30]. Now i have Test matrix [4 10] and every time i try t...

6 years ago | 1 answer | 0

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answer

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Understanding neural networks with patternet
Hello, i am new to neural networks and find it difficult to understand a few things about them. First of all i have created wi...

6 years ago | 1 answer | 0

1

answer

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Split signal if there are zero values
Hello, my task is simple i want to divide my signal into number x parts, where x is when the difference between the last nonzero...

6 years ago | 1 answer | 0

1

answer

Question


Code including multiply embedded for loops with conditions
Hello, i have a signal (nfo) and having found its peaks (pks) and minima (val) i should do the following : If it starts with pea...

6 years ago | 0 answers | 0

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Answered
Extending a vectors length with zeros
Lets assume x(1x3) and y(1x8) Padd=[x,zeros(1,length(y)-length(x))];

6 years ago | 1

Answered
How to calculate moving standard deviation in a matrix?
Take a look here <http://www.mathworks.com/matlabcentral/fileexchange/9428-movingstd-x-k-windowmode->

6 years ago | 0

Answered
create a while loop: while all values in a matrix are positive(code)
You can use the absolute value abs function , or if there are some non positive, by mistake, you can say a(a>0); where...

6 years ago | 0

Answered
Extract the data vectro from cftool
For everyone having the same issue i found a bypass way. Although after i plot the data and when i zoom in i can see clearly the...

6 years ago | 1

| accepted

Answered
how to show a velocity vector at any two point in matlabs on path curve.also acceleration vector at any two point on velocity curve.
If this is the case ou can use plot and hold on to achieve it. t=( 0:0.01:3); x = t.*exp(-3*t)+0.25*exp(-3*t); v=exp(...

6 years ago | 0

Question


Extract the data vectro from cftool
Hello, i have performed curve fitting with cftool , but i cannot accomplish to extract the smoothed data as vector. Instead i ca...

6 years ago | 1 answer | 0

1

answer

Answered
How to write a loop for vectors?
Hello, the main issue is that in your loop you should use cell because for every iteration you have different dice results and t...

6 years ago | 0

Question


Divide time series into regions
Hello, i have a graph with rapidly changes and i need to divide it into regions like are shown in the picture <</matlabcentra...

6 years ago | 2 answers | 0

2

answers

Question


Normalized cross-correlation function
Hello, i am trying to write a normilized cross-correlation method function , but i can't complete it. Here are the details of th...

6 years ago | 3 answers | 0

3

answers

Answered
How do I solve this?
See hold <http://www.mathworks.com/help/matlab/ref/hold.html> .

6 years ago | 0

Answered
How can I divide an audio signal into overlap frames and take FFT to the signal?
There is a function called spectrogram which does what you want , see the related documentation <http://www.mathworks.com/help/s...

6 years ago | 0

Question


help with nested indexing
Hi, my problem is not difficult but i am getting confused about it. So i have two vectors of indexes Nzlocs and locs ...

6 years ago | 1 answer | 0

1

answer

Question


Audioread in loop faster way
Hello, i need to read multiply audio files so i wrote for idx=1:Num filename =['my_dir\data\a',int2str(idx),'.wav']...

7 years ago | 1 answer | 0

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answer

Answered
Delete empty cell array
have you tried something like this? for i=1:length(your_cell_size) idx(i) = find(~cellfun(@isempty,A{i})); ...

7 years ago | 0

Question


Filter signals with variety in noise level
Hello, i am working in a project where i track the fundamental frequency (f0) of a signal using autocorrelation. The algorithm w...

7 years ago | 1 answer | 0

1

answer

Answered
How can i randomly move the values of a vector
use randperm take a look here http://www.mathworks.com/help/matlab/ref/randperm.html

7 years ago | 1

| accepted

Question


Find with condition in loop can't create cell array
Hello, i have to crate a new vector that will have the different number of peaks in each row for each pulse. So i have this grap...

7 years ago | 1 answer | 0

1

answer

Answered
How to segment an wav file off to 2 second interval and FFT every 2 second.
There is the spectrogram take a look here <http://www.mathworks.com/help/signal/ref/spectrogram.html> which performs STFT. Also ...

7 years ago | 0

Submitted


Perform zero-padding
zero-padding for 2 input vectors

7 years ago | 2 downloads |

Submitted


Find valleys (minima) in mono signal
Finds the local minima and their locations

7 years ago | 1 download |

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frequency modulation sinwave with 3 different frequencies
Hi, i want to make a sinwave that will change his frequency 3 times (like in the picture i uploaded <</matlabcentral/answers/...

7 years ago | 0 answers | 0

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answers

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Custom Triangle with up/down slopes , help
Hello i want to make a coustom triangle without using the existing function of matlab, which will start lets say at 300 and will...

7 years ago | 1 answer | 0

1

answer

Question


Creating Mel triangular filters function
Hello, i know there are already plenty functions that create mel filter banks , but i need to create my own function. I found i ...

7 years ago | 2 answers | 0

2

answers