# Angelavtc

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**Content Feed**

Question

combine 2 timetables with different variables into 1 timetable?

I have two timetables with different "time format" I want to merge timetable 1 with timetable 2 to get timetable 3 as the foll...

7 giorni ago | 1 answer | 0

### 1

answerQuestion

Count number of words per row in a string

Say I have the following text: str = [ "an example of a short sentence" "a second short sentence"] I would like to ...

circa un mese ago | 3 answers | 0

### 3

answersQuestion

Count the number of times a word begins with "co" in a text using Text Analytics Toolbox

Dear community, I have a pdf with news headlines, and I need to count the number of words each title has and the number of time...

circa un mese ago | 1 answer | 0

### 1

answerQuestion

Why do I get Cannot fit Power functions to data where X has nonpositive values when using the curve fitting tool?

Dear community, Maybe my question is obvious, but I am trying to estimate a curve with negative values for x using the "powe...

4 mesi ago | 1 answer | 0

### 1

answerQuestion

Find the value of x when the first derivative is equal to 0

Hello community, I have the data x, y (.mat version) from which I compute its first derivative as follows : dy = diff(y)./d...

5 mesi ago | 1 answer | 0

### 1

answerQuestion

How can I change opts.StartPoint for every loop iteration for the predefined points used by the curve fitting tool?

Dear community, Using the curve fitting tool, I have generated the code to fit a curve using specific x and y values. However,...

5 mesi ago | 1 answer | 0

### 1

answerQuestion

How to identify and erase the cells with the error "Error using fit>iFit (line 348). NaN computed by model function, fitting cannot continue" in an array?

Dear community, I have an array (720*1 cell) where in each cell, I have a set of variables x and y. I am estimating the best ...

5 mesi ago | 1 answer | 0

### 1

answerQuestion

Why is it that if I adjust a curve with the curve fitting tool, it does not give me the same results as if I fit it without the tool?

Hello, community, I am trying to fit a series of points with a power function with and without the tool, using the same star...

6 mesi ago | 1 answer | 0

### 1

answerQuestion

How can I find where to split a piecewise regression and find the parameters involved in the function?

Dear matlab community: I am trying to fit several data sets with three distinct regions. Essentially, I want to fit the coeffic...

6 mesi ago | 1 answer | 1

### 1

answerQuestion

Merging three 3D plots into one

Dear community, How can I merge three different 3D plots into one? My figures are saved in .fig (here I attach them), and I wo...

7 mesi ago | 1 answer | 0

### 1

answerQuestion

Why, when I calculate the skewness of a series with constants, do I not get NaN?

Dear Matlab community, I have a simulation of normally distributed numbers with a mean of 76 and a standard deviation of 0, wh...

8 mesi ago | 1 answer | 0

### 1

answerQuestion

Combine multiple columns into a single column keeping the column names?

Dear all, I have a matrix with dimensions 24*366. Each row corresponds to a time in the day (hour 1 to hour 24) and each colu...

8 mesi ago | 0 answers | 0

### 0

answersQuestion

How to retrieve the list of numbers from which the average of a normal simulation is derived?

Hello all! I am currently using the following code to calculate the average of 5000 numbers simulated with a normal distribut...

8 mesi ago | 2 answers | 0

### 2

answersQuestion

3-d plot generated from simulations

Hi all, Could someone please tell me how to generate a graph like the one in the figure below? My idea is that I h...

12 mesi ago | 1 answer | 0

### 1

answerQuestion

Filter a timetable (balance a panel data)

Hello, I have a timetable and I want to keep those days that coincide between each value from my variable "Id". In the examp...

oltre un anno ago | 1 answer | 0

### 1

answerQuestion

Extract data from a timetable excluding an specific date

Hello! I have two timetables. In the first one (tt_1) I have dates and a variable (v1). From this timetable I want to extract ...

oltre un anno ago | 1 answer | 0

### 1

answerQuestion

Removing outliers using standard deviation

Hello everyone, I have a timetable of 8764*3. The first column corresponds to the date, the second to the hour (which goes fro...

oltre un anno ago | 1 answer | 0

### 1

answerQuestion

If and & conditions together

How can I properly formulate the following if. I want to compare each element of 2 vectors [x1_grid and x2_grid] with the same...

oltre un anno ago | 1 answer | 0

### 1

answerQuestion

How to evaluate a polynomial p at each point in y?

How to evaluate a polynomial p at each point in y? I know polyval(p,x) makes the same but for each point in x, but I would lik...

oltre un anno ago | 3 answers | 0

### 3

answersfind delay between two curves

It is because your graph is not shifted but it has a different scale with respect to the independent variable, thats why you fin...

oltre un anno ago | 0

Question

Calculate shifts/translation between two curves

Dear all, Is there a way to determine if the blue curve has shifted from the purple curve? (see graph). As you can see, before...

oltre un anno ago | 1 answer | 0

### 1

answerQuestion

How to find a point within a curve?

Hello to all, How can I calculate a point (the red point) on the same curve but 500 units less than the point indicated in blu...

oltre un anno ago | 1 answer | 0

### 1

answerQuestion

How to change a variable to a time variable?

I have the following excel file (ejemplo.xlsx) where the first column is date (format yyyy-MM-dd) , the second start hour and th...

oltre un anno ago | 2 answers | 0

### 2

answersQuestion

How to know the date to which a group (findgroups) corresponds?

Hello! I have a timetable (TT) where one column is a Date (dd/mm/yyyy format) and another is an Hour, I applied the following ...

oltre un anno ago | 1 answer | 0

### 1

answerHow to find the are between two graphs?

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circa 2 anni ago | 0

| accepted

area under and over the curve

This is wonderful @Image Analyst, with this, you helped me to answer a question that I posted here: https://www.mathworks.com/ma...

circa 2 anni ago | 0

Question

How to find the are between two graphs?

Hello to all! How can I find the area in purple between the two graphs in green and blue? is there a exchange file that can do...

circa 2 anni ago | 1 answer | 0

### 1

answerQuestion

how to find the inflection point from data contained in an array?

Dear all, I have an array of size (360*1 cell) where in each cell I have a set of variables an data as the one that I attach h...

circa 2 anni ago | 2 answers | 0

### 2

answersQuestion

Second derivative from a smoothing spline fit

Hi! I have the following fit curve that I approximate using the Curve Fitting toolbox: And I want to find the points (Volu...

circa 2 anni ago | 2 answers | 0

### 2

answersQuestion

Zero crossing for a curve fitting function(smoothing spline)

Hello, I want find the zero-crossings of a smoothing spline function that I got using the Curve Fitting toolbox and plot the ...

circa 2 anni ago | 1 answer | 0