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# Mario Chiappelli

23 total contributions since 2019

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201 IoT System
PIR (Motion Sensor) AM2320 (Temp & Humidity

2 months ago

How do you update the legend of Figure 2 and Figure 3 instead of Figure 1?
No you don't need to. Here is some example code that I used for a plot for a class project. figure(1); hold on plot(data_time...

6 months ago | 0

Error : Number of elements in 'Timestamps' value must be equal to the number of rows of 'Values' value.
I would assume the issue is that you are reading in (for example) 10 data points that match up with 10 date times. You then are ...

6 months ago | 0

How do you update the legend of Figure 2 and Figure 3 instead of Figure 1?
I have always used the legend function in the following way: legend('nameOfGraphOne','nameOfGraphTwo',etc); I see you are impl...

6 months ago | 0

Labelling Curves on a Graph
The general method would be using the legend function, to which you give a vector of the plot object handles and a series of cor...

6 months ago | 1

| accepted

Make a loop to find each first positive value after a negative value in an vector.
Try this out: numbers = [1,2,3,-1,2,3,4,5,6,-7,-8,10,4,64,12,12,432,221,12]; num = length(numbers); negativeCheck = 0; for...

6 months ago | 0

| accepted

Trouble to construct graph
Check out this documentation: https://www.mathworks.com/help/matlab/ref/matlab.graphics.chart.primitive.histogram.html Most ...

6 months ago | 0

how do i get the position(bottom) of dynamically changing rows of my gui table
This line of code will return to you the number of rows in your table. Just perform it when you need to return the new length. ...

6 months ago | 0

| accepted

Create an Matrix of Variables from a String input
I don't quite understand what you are asking, but if you problem is with getting the cells of the y_var to be separate instead o...

6 months ago | 0

acces data in struct
I would loop through each A,B,C... Other languages call this a for each loop. for str = {'A','B','C'} variableName = strcat(...

6 months ago | 1

saving an output with loop
Save the ouput in an array based off of what iteration you are on. Something like this: outputArray = string(length(subjects));...

6 months ago | 0

Find first non-NaN in each column of array & combine into one vector
Check out this question asked earlier on the forum, I think it asks and answers what you want. https://www.mathworks.com/matl...

6 months ago | 0

How to plot the graph for different values of parameters?
This code worked for me in the past when comparing two graphs, essentially you need to use the hold command. figure(1); hold o...

6 months ago | 0

how to read multiple excel files, apply hampel filter and save them into folder with same names as input files
This task would be a lot easier to accomplish in Visual Basic (VBA).

6 months ago | 0

Question

Trying to compile ThingSpeak Toolbox Support into a standalone App. How to add P file requirements manually.
I am getting this error warning when attempting to compile an app that needs the ThingSpeak Toolbox Support add on in order to p...

6 months ago | 1 answer | 0

### 1

Finding a specific rows?
I would use a double nested For statement and a counter variable as follows: for i = 1:31 % Number of ro...

6 months ago | 0

intensity graph for xy vs z
Here is the documentation for a 3D plot in MatLab https://www.mathworks.com/help/matlab/ref/plot3.html If this doesn't help,...

6 months ago | 0

How do I re-install matlab in my computer?
First you need to properly uninstall matlab from your computer. Find the location of the main matlab file. Mine looks like this...

6 months ago | 0

Channel

Bed Sensor

6 months ago

Question

My geoplot axes keep plotting on top of each other. How do I clear them before plotting again?
Here is a picture of the GUI I am working on. As you can see after a few iterations the axes keep printing on top of the previou...

8 months ago | 0 answers | 0

### 0

Channel

Mario's Project Channel

10 months ago

Channel

Mario's Public Test Channel

11 months ago