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# crixus

### newcastle

25 total contributions since 2015

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Question

How to compute matrix ^ -0.5
Hi, I would like to know how can I compute a matrix X^-0.5. I know that X^-1 is the inverse so in matlab should it be X^-0.5 or...

3 years ago | 0 answers | 0

### 0

Question

Dimension reduction using PCA, PCA whitening and ZCA whitening
Hi all, I briefly understand the concept of PCA, PCA whitening and ZAC whitening which begins 1. Center the data 2. Calcul...

3 years ago | 1 answer | 0

### 1

Question

How to implement nguyen widrow weight initialization ?
Hi, I'm interested to use nguyen widrow weight initialization but i do not want to use the existing matlab function. I have the ...

3 years ago | 2 answers | 1

### 2

Question

Using Deep learning for non image classification
Hi, Can I know is there any example to follow on how to use deep learning for non image classification ? Example using deep l...

3 years ago | 1 answer | 0

### 1

Question

Data Returned By Audio Read ?
Hello all, I have a question in regards to audioread function in matlab (might be easy to some of you). Audioread('wave.wav') wi...

3 years ago | 1 answer | 0

### 1

Question

How to calculate Standard error of mean as shown in minitab website
Hi, I trying to recreate the minitab formula(so that I can use it in Matlab) for calculating standard error of mean as shown in ...

4 years ago | 1 answer | 0

### 1

Why does signal still contain a large number of spikes after FFT
Hi both, thanks for your replies. The code that i used to perform the FFT is as follow x = xlsread('test.csv'); x = ...

4 years ago | 0

Question

Why does signal still contain a large number of spikes after FFT
I have perform FFT on my signal but due to the dc offset my amplitude peaks at 0 hz so i use x = x - mean(x) to remove the dc of...

4 years ago | 3 answers | 0

### 3

Question

How to interpret FFT output, Spectrogram and calculate Spectral centroid
Hi how do i interpret the FFT output, spectrogram (the figures below) and how do I calculate the spectral centroid ? The way i c...

4 years ago | 1 answer | 0

### 1

Question

Questions on FFT and spectrogram
I know that fft transform the time domain into frequency domain and my colleague told me that from the FFT output you can see wh...

4 years ago | 1 answer | 1

### 1

Question

Can we check which data points go into which node for decision tree ?
Hi all, I do know that using the command [yfit,score,node,cnum] = predict(ClassTreeEns,testingdata) will allow you to know whic...

4 years ago | 0 answers | 0

### 0

Question

Is there any reference/guide to code decision tree (CART) from scratch
I know how to use matlab classregtree function but what I want to do is code classregtree from scratch, does anyone know any ref...

4 years ago | 0 answers | 0

### 0

Question

Using fitnet in matlab
If I were to create a neural network based on script using fitnet as shown in (http://www.mathworks.com/help/nnet/gs/fit-data-wi...

4 years ago | 1 answer | 0

### 1

Question

checking the quality of som clustering
Hi all, how can i check the quality of self organizing map clustering, is there something like k means silhouette index plot tha...

5 years ago | 0 answers | 0

### 0

Question

self organizing map number of cluster
Hi all, i would like to ask if i can determine each node of som as one cluster ? For my data,i have already used k means and...

5 years ago | 0 answers | 0

### 0

Question

How to implement clustering to improve data prediction ?
Hi all, i had built a predictive model and through the filtering of data, removal of unimportant data variables as well as remov...

5 years ago | 1 answer | 0

### 1

Question

how matlab determine skewness ?
hi all, i tabulated out my data residual and i do a boxplot on the residual, what i find is the median line is closer to the 75t...

5 years ago | 1 answer | 0

### 1

Question

question on multiple linear regression
hi all, i have a rough idea of how multiple linear regression works(using regression coefficient and error term to predict a sin...

5 years ago | 0 answers | 0

### 0

Question

replacing every columns of nan with the mean of each columns
Hi all, i want to replace every columns of nan with the mean of each columns and i used the following code median1 = nanme...

5 years ago | 1 answer | 0

### 1

Question

how come edit box joins text together even when max - min >1
Hi, i have a edit box in a gui where i want it to collect all the numbers in it, i changed the value of max to 24 when min remai...

5 years ago | 1 answer | 0

### 1

Question

How Can I Perform Loop By Checking Values of Matrix
Hi all, I am wondering how should i go about to do a loop by checking values in a matrix, removing them until all the unwanted c...

5 years ago | 0 answers | 0

### 0

Question

Parameter Importance For Neural Network
Hi all, i am trying to see which of my input is more important when using neural network, something like [ TreeBagger(100,Xtrain...

5 years ago | 1 answer | 0

### 1

Question

Removing rows from all columns based on values of one column
Hi all, i have a data of 732x26 and one of the column contains unwanted values, i used logicalIndex = FOMassFlow > MeanFOMas...

5 years ago | 2 answers | 0

### 2

Question

Diesel Engine Modelling Using Machine Learning Techniques
Hi all, I am wondering is there any help online i can get where i can learn how to model a diesel engine using machine learning ...

5 years ago | 1 answer | 0