Question

Macros in Matlab - repeating simple instructions
Hi there, I have read on some websites that writing macros for Matlab is not advisable? I am trying to write several as I am ...

presque 12 ans il y a | 3 réponses | 0

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Problem with dimensions, filling a matrix in a for loop
sorry guys that is an old code where I had changed variables names the actual code is as follows; clc clear all; ...

presque 12 ans il y a | 0

Question

Problem with dimensions, filling a matrix in a for loop
I am trying to work out the root mean square of my data in sections of 2 seconds. However, the dimensions the matrix Az1 etc is ...

presque 12 ans il y a | 2 réponses | 0

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réponses

Question

Time aligning data - an unusual situation
Hi there I have a rather difficult problem. I am trying to align data from different sensors placed on different parts of a p...

presque 12 ans il y a | 1 réponse | 0

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Question

Trying to get rid of a dc offset - tried other methods posted but to no avail
I am applying the FFT function to data from an accelerometer and I have a large spike at 0Hz. I understand that this could be ...

environ 12 ans il y a | 1 réponse | 0

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réponse

Question

Peak finder - finding major peaks instead of just the smaller ones
I want to use a peak finder to find the major peaks in my spectrum, however, when I use {pks, locs] = peakfinder() I get all ...

environ 12 ans il y a | 2 réponses | 0

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Question

Low pass Filter - designing one
Hi there I am currently trying to perform FFT on an acceleration signal. I have values in terms of g values, ie 0.95g etc. I ...

environ 12 ans il y a | 1 réponse | 0

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Question

Problems using trapz() - dimension issue
clc clear all; Az=load('TEXT PILOT CC LANKLE_converted_1.txt'); Az1=Az(:,1);%looking at the velocity in x first A ...

environ 12 ans il y a | 1 réponse | 0

1

réponse

Question

velocity from accelerometer using numerical intergration
I have a problem I have a trace from an accelerometer and I want to convert this into velocity I do not major in physics and I w...

environ 12 ans il y a | 1 réponse | 0

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Appropriate window from accelerometer data
Also can I also say that my code so far is as follows; x1 = data (from section1 a period of walking and jumping) y1 = x1...

environ 12 ans il y a | 0

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Appropriate window from accelerometer data
Also would perhaps a low pass filter work?

environ 12 ans il y a | 0

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Appropriate window from accelerometer data
Also its important for me to add that all my plots from the various sections of data look the same with just large spikes at the...

environ 12 ans il y a | 0

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Appropriate window from accelerometer data
Hi there I was wondering if you could have a look at the graph I have made from one of the sections from my data. The large spik...

environ 12 ans il y a | 0

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Appropriate window from accelerometer data
Hi there thanks so much for the suggestion, When I apply this method though I get the error message saying that the dimensions m...

environ 12 ans il y a | 0

Réponse apportée
Appropriate window from accelerometer data
Hi there, I have been thinking about my problem in more depth and have realised that I may need to preprocess my data. Basica...

environ 12 ans il y a | 0

Question

Appropriate window from accelerometer data
I am attempting to put my data through the fat function however, it seems that due to high spikes at the ends I may need to use ...

environ 12 ans il y a | 8 réponses | 0

8

réponses

Question

'load' command - loading and using data from a .MAT file
Hi there I would like to load data from a .mat file but retain it's structure. It is a 17x17x17 matrix and at the moment I am si...

plus de 12 ans il y a | 1 réponse | 0

1

réponse

Question

Spherical harmonics - finding the coefficents of values of ODFs
Hi there, I am very new to the study of spherical harmonics and I was wondering if you could help me. I have values of my ODF...

plus de 12 ans il y a | 1 réponse | 0

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Question

working out the vertices of polyhedra
I am trying to work out the vertices of various sized polyhedra. I want equally spaced points on a sphere of radius one (ie goin...

plus de 12 ans il y a | 1 réponse | 0

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eigenvalues - determining the three major eigenvalues from a matrix
Well I actually would like to work out the principal Eigen vector for a ODF which is in the form of a vector but I'm not really ...

plus de 12 ans il y a | 0

Question

eigenvalues - determining the three major eigenvalues from a matrix
Is there a code or program I can download which will determine the three main eigenvalues,; t1 t2 and t3 of a matrix as I really...

plus de 12 ans il y a | 3 réponses | 0

3

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Question

More sophisticated code than a for loop with i is large
Hi there I am trying to calculate a scatter matrix for some data. so basically my Eigen values are in a matrix of the form; [e11...

plus de 12 ans il y a | 2 réponses | 0

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Question

while statements - imposing two conditions
Hi there I am trying to impose a while loop with two conditions; while (L2normpercentold>=tol)&&(any(Diffpart1>0.0001)) Howe...

plus de 12 ans il y a | 2 réponses | 0

2

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Question

output history and testing convergence
Hi there, I have quite a complicated algorithm running and I would like to test to see if it converges as it is taking a very...

plus de 12 ans il y a | 1 réponse | 0

1

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Problem with ifftn and ifftshift??
Thanks so much for the help! I will try your suggestion! :D

plus de 12 ans il y a | 0

Question

finding places where an array are equal to zero and replacing them accordingly
I have written some code, however, due to the fact that my alogirthm is really quite complicated it is hard for me to see if my ...

plus de 12 ans il y a | 1 réponse | 0

1

réponse

Question

Problem with ifftn and ifftshift??
Hi there I was wondering if someone could help me. I am using the fftn fftshift functions as part of my alogrithm; tmp = fftn...

plus de 12 ans il y a | 2 réponses | 1

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Question

Indexing problem - how to obtain row and column and use later
If I have a matrix A = [ 1 2 3; 2 3 4; 2 0 8; 4 8 0; 1 2 0; 0 0 0] and I wanted to store the places where the zeros exist and t...

plus de 12 ans il y a | 1 réponse | 0

1

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Comparing data from previous iteration with data from this iteration
Hi there, yes I see the problem with what I was trying to do. I have only used while loops in the context of single value sol...

plus de 12 ans il y a | 0

Question

Comparing data from previous iteration with data from this iteration
I want to terminate my loop when the difference between two iteration has an L2 norm of less than 0.1% I thought this was done i...

plus de 12 ans il y a | 2 réponses | 0

2

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