Cris LaPierre

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MathWorks

1.222 total contributions since 2018

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Answered
Script: Indexing in function problem
Functions cannot be defined in the middle of your code. You will need to either place it at the bottom of your script, or in a s...

4 días ago | 0

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How to get files back from the cloud MATLAB Online?
MATLAB Drive is the file system used in MATLAB Online and MATLAB Mobile. You can access your files at drive.matlab.com. You cou...

4 días ago | 0

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How to make the x and y vector the same length
Take a look at the documentation for linspace. If you only input the start and stop values, linspace creates a vector with 100 ...

5 días ago | 0

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getting error in simulink onramp "Matlab Function block 7.2"..Failed to evaluate mask initialization command..
You need to connect the Signal Assessment block to the output signal labeled "Power". However, when I tested without having it ...

5 días ago | 1

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Cannot load built-in Image Histograms example from App Designer window
I don't know why that would have happened. Reinstalling might fix the issue. You might check if the app is on your computer. It...

5 días ago | 0

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surface plot face not showing colors corresponding to Zgrid in some areas
This has to do with how surface plots are created. For an alterante explanation, see this post. Basically, your values are repr...

6 días ago | 0

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plot3(X,Y,Z)
With plot3, you do not have to use meshgrid. Just create a vector a X values, a vector of Y values, and compute your Z values fr...

7 días ago | 0

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D'Agostino's skewness test
I'm not familiar with what R does, but you can see the algorithms used in MATLAB's skewness function here.

7 días ago | 0

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Grayscale Image cannot be output in the GUI Matlab
The function rgb2gray returns an mxn matrix. However, as you can see in the error message, the image component in an app require...

7 días ago | 0

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Attempt to execute SCRIPT ... as a function:
The issue is that you are treating your script as a function. Functions have inputs, scripts do not. >> testfunktion(10) Just ...

7 días ago | 1

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I need help finding the mean/avg of my data set
I would use groupsummary for this. Keep your data in a table. We don't have your data to test with, but here's a simple examp...

7 días ago | 0

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Taking geo data and turn it into cartesian plot
Why not take your cartesian X,Y values, and convert them to lat/lon? Use the local2latlon function. You can then plot everything...

8 días ago | 0

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why there are 0's in my matrix?
You predefine your matrix A as zeros. So when you get to an equation that multiplies the original value in A to create the new v...

8 días ago | 0

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HOW TO READ A .WRL FILE IN MATLAB?
The most obvious error I see is that you change the varialbe name when you append the '_'. You save that result to filename. You...

8 días ago | 0

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Why do I get "Array indices must be positive integers or logical values." Image processing.
You get that error because any time you use indexing to extract values from a variable, the index number must be integers >= 1. ...

8 días ago | 1

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If clause – if column blank than
Try isempty instead of ==[].

8 días ago | 0

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Indexing by year from full date
I'd convert your dates to datetimes. Then you can just use the year, month, and day functions.

8 días ago | 0

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How do I convert a string to a datetime?
Assign your string to the variable my_string my_string = "19:00:06 01.04.20"; t=datetime(my_string,'InputFormat','HH:mm:ss dd....

8 días ago | 0

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for loop in matlab
The values are changing because the indexing inside the for loop is telling it where to place the values. I'm going to direct ...

9 días ago | 0

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How can I fill by color the paired boxplots?
You could use the "BoxStyle","filled" name-value pair. Note that, since the data is random, my plot won't look the same as your...

9 días ago | 0

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Answered
How to plot 3D data in 2D graph
You could create a 3D plot, and then rotate it so you are just looking at the XY plane. You can do this using view(2). You could...

9 días ago | 1

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How to add strings to an array within a loop
If you are using strings, you can create this just using "+". legend_names = "Case_" + string(1:5)

9 días ago | 1

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Answered
How to split tables and extract all data based on a column value?
See this page on how to access data in a table. You are close. Don't forget to include both row and column indices, and make th...

9 días ago | 1

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2-D plot
I suggest MATLAB Onramp. Ch 9 covers the basics of plotting. You'll also need Ch 12 (logical arrays).

9 días ago | 1

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Trouble with while loop
You appear to have one too many ends in your code. That's not going to fix your infinite loop, but it needs to be fixed, too. U...

9 días ago | 0

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How do I import the data correctly for it to accept it?
I'd suggest looking into how to load data from a text file.

9 días ago | 0

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Drawing a tangent line on plot but keep getting the error "array indices must be positive integers or logical values"?
You need to include the multiply operator: y=k*(x-x1)+y1;

9 días ago | 1

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How to plot values of a variable Z on an arbitrary 2D path in X and Y
Since you have the equation, just create vertors for X and Y of the line, then solve for Z using those values. Assuming that's ...

9 días ago | 0

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Answered
how to plot the mean of values from swept data
Sure. Use groupsummary. Your grouping variable is your dependent variable, your method is 'mean', and your datavar is your indep...

9 días ago | 0

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How to generate a colourmap for a 2D denisty map?
It looks like your comparison image has had the color axis manually adjusted (rt click on colorbar and select "Interactive Color...

9 días ago | 0

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