# stelios loizidis

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**Content Feed**

Question

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...

2 months 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...

3 months 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,:)...

4 months 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...

4 months 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...

4 months 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...

4 months 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...

6 months 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 ...

8 months 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...

8 months 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....

10 months 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:...

10 months 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...

10 months 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 ...

10 months 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)...

1 year 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 ...

1 year 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...

1 year 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...

1 year 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...

1 year 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...

1 year ago | 1 answer | 0

### 1

answerQuestion

Placing data in a matrix

Hello I have the following problem: I have a matrix A (12708X1). I want to put the data of matrix A in a matrix B which has siz...

1 year ago | 1 answer | 0

### 1

answerQuestion

Import hours from a excel file

Hello, in a excel file I have 24 values in the first column and in the second column I have the corresponding hours (format of h...

1 year ago | 1 answer | 0

### 1

answerQuestion

How to select specific data from one matrix and place it in another

Hello, I have the following problem. I have a large matrix A (1X960). At positions 336 I have the prices for 14 consecutive Mon...

1 year ago | 3 answers | 0

### 3

answersQuestion

Comparison of specific values from the same matrix

Hello. I have the following problem: I have a table Z (1X100). The first value is always zero. I want to find among the other v...

1 year ago | 1 answer | 0

### 1

answerQuestion

How the results are stored in a .xlsx file?

Hello, I have the following problem: I want to calculate the RMSE. More specifically I run the algorithm five times and then ad...

1 year ago | 1 answer | 0

### 1

answerQuestion

Save data from for-loop and their use

Hello, I have the following problems. I have matrices: SatTrDatax_Norm (4X200) and SatTrDatay_Norm (4x50). I want to apply wave...

2 years ago | 1 answer | 0

### 1

answerQuestion

How to run a code several times using a for loop

Hello, I have the following problem: I want to run the following code for 50 interations, and saving the values of matrix A1, B...

2 years ago | 2 answers | 0

### 2

answersQuestion

Select the correct data from matrix

Hello. I have the following problem: For a product I predict the prices it will have the next day (24 prices). I use 5 models to...

2 years ago | 1 answer | 0

### 1

answerQuestion

Data comparison and selection the smallest

Hello. I have a matrix A which has size of 24X5. I want each row in matrix A to be selected the smallest and stored in matrix B....

2 years ago | 2 answers | 0

### 2

answersQuestion

Create a matrix through replacement, from another matrix

Hello. I have a matrix A (5X5) and I want to create a matrix B (of the same size as A) and its values come from matrix A. Also, ...

2 years ago | 1 answer | 0

### 1

answerQuestion

Create a matrix with values in a specific position from another matrix

Hello, I have a matrix with hourly prices for a product. That, is 24 prices for one day. Also, these prices are for one month. I...

2 years ago | 1 answer | 0