# Enrico Gambini

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**Content Feed**

Question

Cumulative sum between two trues in array according to positions stored in logical array

Hello! I would like to find a fast way to get cumulative sums of values of an array according to the starting and ending positi...

3 months ago | 1 answer | 1

### 1

answerFrom User Input to File Name

Try to use the function "strcat" and "string" str=string(answer); writematrix(A,strcat(str,'+TEST.csv'))

3 months ago | 0

Question

Find where certain sequence of true/falses is placed inside a logical array

Hello! Assume that I have the following logical array: x=[false;false;true;true;true;true;true;false;true;true;true]' I would...

4 months ago | 1 answer | 0

### 1

answerQuestion

Change sequence of consecutive trues to falses, in logical array

Hello guys! I would like to find a fast procedure to change from true to false the consecutive trues in a logical array excludi...

4 months ago | 2 answers | 0

### 2

answersQuestion

Count number of cells separating two trues in logical vector

Hello! I would like to find a fast procedure to count the number of cells separating two trues in a logical vector, and store t...

4 months ago | 1 answer | 0

### 1

answerQuestion

Get array of elements based on occurrences of another vector

Hi guys! Let's assume that you have 2 Nx1 arrays "y" and "x", is there a way to find all the elements of y corresponding to the...

5 months ago | 2 answers | 0

### 2

answersQuestion

Select columns of a table using matching column names

Hello everyone! I'm facing the following problem: I have a cell array containing strings, let's call it "v" On the other hand ...

8 months ago | 1 answer | 0

### 1

answerQuestion

Area of a polygon in UTM coordinates

Hello! Anyone knows how to calculate the area inside a polygon whose coordinates are in the carthographic UTM32N system? I woul...

8 months ago | 0 answers | 0

### 0

answersQuestion

Is it possible to clip shapefiles in MATLAB?

Is there a way to clip a shapefile using polygons or other shapefiles in MATLAB like in GIS? Like this: https://pro.arcgis.com/...

8 months ago | 1 answer | 0

### 1

answerHow to select same numbers with tolerance?

Hi, try this: X = [ 2.5,3.65,0,0.25,0.35,0.035,0.00025,1,4.65,5.85]; Y=X(X<1)

10 months ago | 0

How Normalize each column to itself mean value

Hi, you can try this: T=readtable('Cartel3.xlsx'); n_years=10; %In your file you've got 10 years, you can obvioysly change it ...

10 months ago | 0

| accepted

Question

Add NaN values in a timetable based on missing datetimes

Hi guys. Let's say that I have timetable with n rows containing hourly data starting from date "t1" and ending on date "t2", th...

10 months ago | 1 answer | 0

### 1

answerHow to define a variable as a condition of other variables

Hi. Generally matlab "doesn't like" for loops like other programming languages. That's because in most of the cases there is th...

11 months ago | 0

ERROR : Unrecognized function or variable , Index exceeds the number of array elements

Hi, try this. er1 = 2.55; er2 = 1; eta_1 = 377; eta_2 = 377/sqrt(er1); sin_theta_b = 1/sqrt(1+er1/er2); cos_theta_t = sqrt...

11 months ago | 0

In the following in program, I want print only the resultant Matrix D which its sum is zero also their corresponding combinations Matrix E a using any conditional statements

If I got it right... if ((sum(any(D,'all'))<=1) & (sum(D,'all'))==0 &(sum(any(E,'all'))<=1) & (sum(E,'all'))==0) fprintf("Matr...

11 months ago | 0

Question

Estimate p-values of fitted parameters using armax from sysid toolbox

Hello! I'm looking to find a way to find the p-value of the estimated parameters of an armax model fitted using the "armax" com...

11 months ago | 1 answer | 0

### 1

answerQuestion

Best matlab package for time series modelling

Hello! Until now, I have always analyzed the time series in a theoretical way. Now I finally have to move on to practice. In pa...

11 months ago | 1 answer | 0

### 1

answerQuestion

Combine date and duration into single datetime column

Hello! I have a vector containing the data in a datetime format (MM/dd/uuuu)and the vector containing the hours of the days in ...

11 months ago | 1 answer | 0

### 1

answerCreate Correlogram plot with given data

If you don't have any input file (such as a txt or a csv) from where you can import data directly into matlab, I guess you need ...

11 months ago | 1

| accepted

How can I put the values of the y-axis in a vector and find the maximum?

You mean this? H_sorted=sort(H); %sort vector "H" in ascending order idx=find(H==H_sorted(end-1)); %find the index of the seco...

12 months ago | 1

| accepted

How do I convert one row of values using a unit conversion?

PDATA_in_meters=PData/1000;

12 months ago | 0

| accepted

How to add a new column in a table and then write on a file only some columns?

Hello Giuseppe. To create your column of indexes you can do the following: idx=[1:height(Tab_ast_str)]; then Tab_ast_str.in...

12 months ago | 1

When i run my code it says Unrecognized function or variable A.

Define A=4 outside the function

12 months ago | 0

how to filter variables after Pearson correlation test

I didn' fully get your question. If you want to delete the variable columns from the matrix you can do the following: %I will...

12 months ago | 0

| accepted

Matching two columns from an imported table to find the corresponding value in the 5th column.

One method to extract what you want could be temp=input("Insert temperature: \n"); %here you insert the parameters in the c...

12 months ago | 0

| accepted

How can I improve the readability of a text file produced with writetable?

Hi, I think that the export worked well. If you want to increase the readability of the textfile i think you should set less dec...

12 months ago | 1

| accepted

Question

Delete rows from a table using a condition on datetimes

Hello! I'm working with a table T having two separate datetime columns containing dates ('M\d\yyyy'): let' say the first column...

1 year ago | 1 answer | 0

### 1

answerQuestion

Extract values from tables with different number of columns using a specified condition

Hello everyone! I'm trying to do something that I am not able to do actually, and I hope it is possible. I need to ask for some...

1 year ago | 0 answers | 0

### 0

answersQuestion

Delete m consecutive rows every n rows

Hello! I'm looking to find a way to delete certain rows in a big table that i'm working with. I would like to find a smart way t...

1 year ago | 2 answers | 0