# stelios loizidis

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**Content Feed**

Question

GARCH model for day-Ahead stock price forecasting

Hello. I want to forecast stock market prices one day ahead (i.e 48 prices ahead). In the TrainDatax matrix (50X72) I have the ...

5 maanden ago | 1 answer | 0

### 1

answerQuestion

How to make a surface plot for two vectors?

Hello, I have two row-vectors, A (1X8000) and B (1X8000). What I want is their surface plot. I tried the commands below: surf(...

10 maanden ago | 1 answer | 0

### 1

answerQuestion

Scale/Normalize values in matrix between 10^-6 and 10^-5

Hello, I have a matrix Data (90X150) and I want its values to be normalized. I wrote the code below: % Normalization min_Data...

ongeveer een jaar ago | 1 answer | 0

### 1

answerQuestion

Finding position of values which are equal to some value

Hello, I am trying to find the position of values in the ND matrix (1X1800) which are equal to the val matrix (1X6) according t...

ongeveer een jaar ago | 1 answer | 0

### 1

answerQuestion

Select values based on datetime

Hello, I have the matrix Values (1X2100) and the corresponding DateTime matrix with datetime data (1x2100 datetime). The values...

ongeveer een jaar ago | 2 answers | 0

### 2

answersQuestion

Creating a matrix based on sorted values from another matrix

Hello, I have matrix A, 1X5, and matrix B, 1X5 % Matrix A A=[0.0012,0.0011,0.0011,0.0014,0.0015]; % Matrix B B=[40.5,66,12,...

ongeveer een jaar ago | 1 answer | 0

### 1

answerQuestion

Repeat resampling with replacement process several times

Hello, I have the below code for resampling with replacement. res1 = []; res2 = []; % centerd matrix size:2X7 cen1=cent...

meer dan een jaar ago | 1 answer | 0

### 1

answerQuestion

Finding specific values from a matrix

Hello, I have the matrix Values (1X3000), upper limit (=100) and lower limit(=30). What I want is for the Specific_Values matri...

meer dan een jaar ago | 1 answer | 0

### 1

answerQuestion

Box plot into figure with another graphs

Hello, I have a matrix with predictions (100X24). I sorted this matrix and made a plot of the confidence intervals (maximun and...

bijna 2 jaar ago | 1 answer | 0

### 1

answerQuestion

Storing matrices in cells

Hello, I have the following code: for i=1:20 %psudoinverse pH_matrix=pinv(H_matrix); % H_matrix: 1X20 B=pH_matrix*Y(i,:);...

bijna 2 jaar ago | 1 answer | 0

### 1

answerQuestion

I want vector surface plot

Hello, I have three vectors: Prices:1X30, Position:1X30 and Quantity:1X30 and I want to do the surface plot. I get the followin...

bijna 2 jaar ago | 2 answers | 0

### 2

answersQuestion

Labels above bar-plot

Hello, I have a matrix A (1X40). For this matrix I make its bar-plot. Aslo, I have the matrix B (1X40) which contains values, w...

ongeveer 2 jaar ago | 3 answers | 0

### 3

answersQuestion

Assign dates with number

Hello, I have the following code % read from excel file [~,~,Data]=xlsread("Fuels_2019_2020.xlsx","Fuels_2019_2020") Fuels_D...

ongeveer 2 jaar ago | 1 answer | 0

### 1

answerQuestion

How can the points of a scatter plot placed on a new matrix?

Hello, I have the following. I have a matrix W (2Χ50) and I make the scatter plot for each of its row, that is, scatter(W(1,:)...

ongeveer 2 jaar ago | 1 answer | 0

### 1

answerQuestion

Create a plot with values from matrices of many dimensions.

Hello, I have the following matrices: A:10X10X10X10, B:10X10X10X10, C:10X10X10X10, D:10X10X10X10 and S:10X10 What I want is a...

ongeveer 2 jaar ago | 1 answer | 0

### 1

answerQuestion

Initial values on the plot

Hello. I have a matrix X (2X40). In the values of this matrix I apply normalization and matrix Xnorm appear (2X40). Next, I make...

meer dan 2 jaar ago | 1 answer | 0

### 1

answerQuestion

contour3-With 3 dimensions input arguments

Hello. I have the following: Α:24X24X24, B:24X24X24 and C:24X24X24 I want to make the contour3 plot contour3(A,B,C) but it s...

meer dan 2 jaar ago | 2 answers | 0

### 2

answersQuestion

Create a triangular matrix

Hello, I have the following issue. I have a matrix A with dimensions 3x500 and I want to calculate the matrix B which is triang...

meer dan 2 jaar ago | 1 answer | 0

### 1

answerQuestion

Find similar values from different tables

Hello. I have two matrices, the A1 (270X1) and the A2 (171X1). Matrix A2 has some values, which are the same as some of matrix ...

meer dan 2 jaar ago | 1 answer | 0

### 1

answerQuestion

Replace number with text

Hello, I have the following problem. I have a matrix A which has dimensions of 300x350. In this matrix I want to replace the val...

meer dan 2 jaar ago | 2 answers | 0

### 2

answersQuestion

Replace values in a matrix

Hello. I have the following problem. I have a matrix A with dimensions 1X72. I want in matrix B to have the mean per 24 values....

meer dan 2 jaar ago | 1 answer | 0

### 1

answerHow do I find the number of hours?

Another question I have is if I have table A but the available data are as follows: 1/2/2014 01:00, 4/5/2014 05:00, 6/8/2014 16:...

meer dan 2 jaar ago | 0

Question

How do I find the number of hours?

Hello, I have a matrix A with dimensions 35000X1 (datetime). There are hours in matrix A. For example, 01:00, 05:00, 17:00, 23...

meer dan 2 jaar ago | 3 answers | 0

### 3

answersQuestion

MAE and RMSE in percentage

Hello, I have the following question: I want to calculate the MAE and RMSE in percentage. The following code gives the correct ...

meer dan 2 jaar ago | 1 answer | 0

### 1

answerQuestion

How do I find the corresponding dates for maximum prices?

Hello. I have a matrix A with dimensions 366x24 which contains values and a matrix B which contains dates-time (366x24 datetime)...

ongeveer 3 jaar ago | 1 answer | 0

### 1

answerQuestion

How do I read (hours) data from the .xlsx file?

Hello, I have the following issue. In a .xlsx file I have in column D hours (format: 00: 00: 00,01: 00: 00, ... 23:00:00). How ...

ongeveer 3 jaar ago | 2 answers | 0

### 2

answersQuestion

Separate datasets into months

Hello,I have the Data matrix (1X1744) which contains values for two years (2014-2015) and Time (1X1744) is datetime contains the...

ongeveer 3 jaar ago | 1 answer | 0

### 1

answerQuestion

Multiplication between matrices with different dimensions

Hello. I have the following issue: I have the matrix H which has a size of 353X25. Next I calculate the pseudo-inverse H_inv (25...

meer dan 3 jaar ago | 1 answer | 0

### 1

answerQuestion

Save values from iterations

for r=1:5 for w=1:100 Datax(r,:)=(W'*NewDatax(r,:)')'; % size: NewDatax 5X70 ntempDatax=Datax+b; Values(r,:)=ntempData...

meer dan 3 jaar ago | 1 answer | 0

### 1

answerQuestion

Add elements to a matrix

Hello. I have the following problem: I have a matrix A (3x3), and I want to add elements to this matrix and create table B wit...

meer dan 3 jaar ago | 1 answer | 0