Manolis Michailidis
Alexander Technological Institute of Thessaloniki
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Error in testing neural
i just found my error, the test matrix should have the same dimensions as the train
mer än 9 år 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...
mer än 9 år 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...
mer än 9 år 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...
nästan 10 år 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...
nästan 10 år 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))];
ungefär 10 år 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->
ungefär 10 år 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...
ungefär 10 år 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...
ungefär 10 år 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(...
ungefär 10 år 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...
ungefär 10 år 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...
ungefär 10 år 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...
ungefär 10 år 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...
ungefär 10 år ago | 3 answers | 0
3
answersHow do I solve this?
See hold <http://www.mathworks.com/help/matlab/ref/hold.html> .
ungefär 10 år 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...
ungefär 10 år 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 ...
ungefär 10 år 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']...
ungefär 10 år 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})); ...
mer än 10 år 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...
mer än 10 år 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
mer än 10 år 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...
mer än 10 år 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 ...
mer än 10 år ago | 0
Submitted
Find valleys (minima) in mono signal
Finds the local minima and their locations
mer än 10 år 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/...
mer än 10 år 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...
mer än 10 år 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 ...
mer än 10 år ago | 2 answers | 0
