# NCA

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Question

How to interpret and determine clusters in SOM Neighbour Distance Plot

I need help interpreting and identifying clusters in the attached SOM Neighbour Distance plot. I am not sure how to determine th...

1 year ago | 1 answer | 0

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answerQuestion

How to get the exact samples inside SOM neurons

I have abalysed my data using neural clustering for Self Otganising Maps from the Neural Net Clustering from Machine Learning an...

1 year ago | 1 answer | 0

### 1

answerQuestion

How to cluster data with multiple classes with SOM and colour the map

My data has 1700 rows (samples) and 186 predictors. I have 52 different groups or classes (Grp 1, 2, 5, 23, etc up to 52) to clu...

1 year ago | 1 answer | 0

### 1

answerQuestion

How to use various combinations of samples to build model

I am trying to use different combinations of the samples in my data(X) on each iteration to build a SVR model with fitrsvm until...

1 year ago | 1 answer | 0

### 1

answerQuestion

How to select samples to leave out when building my regression model and automate it

I am using fitrsvm (Support Vector Regression) on my data matrix (I have attached an excel example version of it). I have abou...

1 year ago | 1 answer | 0

### 1

answerQuestion

How to predict responses of new data from a crossvalidated SVR model

Hi there I have trained and cross validated my Support Vector Machine regressor model (CValidated_Mdl) with KFold cross validat...

1 year ago | 1 answer | 0

### 1

answerQuestion

How do I match corresponding rows of class labels to data

I have 838 by 400 matrix as my data, I also have a 275 by 2 file which contains my class labels but they are not organised to m...

2 years ago | 1 answer | 0

### 1

answerQuestion

How do I average a matrix in steps but they are not all in equal steps

I have a matrix of 2214 by 8001, the absorbances were measured 5 times for each sample but some signals were were not good enou...

2 years ago | 1 answer | 0

### 1

answerQuestion

I have a data in cell array of 1330 rows x 401 columns, I want to take the mean in steps of 5 and have the new matrix as 266 x 401 instead of 1330 x 410.Thanks for your help

I have a data in cell array of 1330 rows x 401 columns, I want to take the mean in steps of 5 and have the new matrix as 266 x 4...

2 years ago | 1 answer | 0

### 1

answerQuestion

What type of cross validation to use if my data has 5 scans per sample to avoid having same sample in train and test set

My data (150 samples) has 5 NIR scans per sample. I am not able to average the 5 scans because some of them were taken out as t...

2 years ago | 1 answer | 0

### 1

answerQuestion

How to get DBSCAN to assign the items to the clusters found

I have used DBSCAN on MATLAB R2021 to cluster my data into 3 groups. I want to be able to get DBSCAN to actually assign and name...

3 years ago | 1 answer | 0

### 1

answerQuestion

New variables after computing Principal Components Analysis

After computing principal components analysis, what will represent my new variables to be used to build my model , is it the sco...

3 years ago | 2 answers | 0

### 2

answersQuestion

How do I normalize Area under curve of NIR spectra to 1

How do I normalize Area Under Curve of NIR spectra to 1 using Matlab 2020b please? Thank You

3 years ago | 1 answer | 0

### 1

answerQuestion

How to read multiple .spc files

Hi there Please can someone help me with this I am using tgspcread to open/read my spectral data files I need to read 222 .sp...

3 years ago | 2 answers | 0

### 2

answersQuestion

I am not sure why my if statement code is not working

I have this code which omits the first two conditions and executes the last one , can you please have a look as I have tried it ...

3 years ago | 1 answer | 0

### 1

answerSolved

Times 2 - START HERE

Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

3 years ago