# Manolis Michailidis

### Alexander Technological Institute of Thessaloniki

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**Feeds**

Error in testing neural

i just found my error, the test matrix should have the same dimensions as the train

ongeveer 8 jaar 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...

ongeveer 8 jaar ago | 1 answer | 0

### 1

answerQuestion

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...

ongeveer 8 jaar ago | 1 answer | 0

### 1

answerQuestion

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...

meer dan 8 jaar ago | 1 answer | 0

### 1

answerQuestion

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...

meer dan 8 jaar ago | 0 answers | 0

### 0

answersExtending a vectors length with zeros

Lets assume x(1x3) and y(1x8) Padd=[x,zeros(1,length(y)-length(x))];

bijna 9 jaar ago | 1

How to calculate moving standard deviation in a matrix?

Take a look here <http://www.mathworks.com/matlabcentral/fileexchange/9428-movingstd-x-k-windowmode->

bijna 9 jaar ago | 0

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...

bijna 9 jaar ago | 0

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...

bijna 9 jaar ago | 1

| accepted

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(...

bijna 9 jaar 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...

bijna 9 jaar ago | 1 answer | 0

### 1

answerHow 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...

bijna 9 jaar 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...

bijna 9 jaar ago | 2 answers | 0

### 2

answersQuestion

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...

bijna 9 jaar ago | 3 answers | 0

### 3

answersHow do I solve this?

See hold <http://www.mathworks.com/help/matlab/ref/hold.html> .

bijna 9 jaar ago | 0

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...

bijna 9 jaar 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 ...

bijna 9 jaar ago | 1 answer | 0

### 1

answerQuestion

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']...

bijna 9 jaar ago | 1 answer | 0

### 1

answerDelete empty cell array

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

bijna 9 jaar 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...

bijna 9 jaar ago | 1 answer | 0

### 1

answerHow can i randomly move the values of a vector

use randperm take a look here http://www.mathworks.com/help/matlab/ref/randperm.html

bijna 9 jaar 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...

ongeveer 9 jaar ago | 1 answer | 0

### 1

answerHow 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 ...

ongeveer 9 jaar ago | 0

Submitted

Find valleys (minima) in mono signal

Finds the local minima and their locations

ongeveer 9 jaar ago | 1 download |

Question

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/...

ongeveer 9 jaar ago | 0 answers | 0

### 0

answersQuestion

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...

meer dan 9 jaar ago | 1 answer | 0

### 1

answerQuestion

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 ...

meer dan 9 jaar ago | 2 answers | 0