Cris LaPierre

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MathWorks

1,023 total contributions since 2018

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Answered
Index in position 1 is invalid. Array indices must be positive integers or logical values.
Your values are not integers. For example, what value should rat_ink(79.7,1) return? Valid indices are 1, 2, 3, etc.

6 hours ago | 0

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Change scale of second y-axis on figure
Use the ylim function to set the yaxis limits.

6 hours ago | 0

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Error using sin Not enough input arguments
sin is a function, which means you must give it an input. The error here is with the code sin*t at the end of your expression. D...

6 hours ago | 0

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Convert a map in shapefile into occupancy map
I'll take the "offer a tip" route. That means I may not know what I'm talking about. I have some familiarity with shapefiles, b...

3 days ago | 0

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How to find average value of every 10 numbers within a set of numbers?
The problem is how you set up your loops. The first value of i is the length of speed, 452. The first value of j is trying to i...

3 days ago | 0

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Using text, 2 variables, and decimals in fprintf
The documentation page is a great place to start. There, you'll see that the variables have to come at the end. Also, you don't ...

3 days ago | 0

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Try catch error function not working
Your code must generate an error in the 'try' portion before it will execute what is in the catch. I don't see any reason why th...

3 days ago | 0

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Help me to Solve ODE problem
Check your equations. Sr is always zero. This causes cst to always be zero, which then causes drdt to also be zero, causing dRdt...

4 days ago | 0

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How can I read data from excel file consecutively rather than taking random numbers ?
Maybe I don't understand your question, or you don't understand your code. Your code tells it to load a random file, and then c...

4 days ago | 0

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Working with fileDatastore and loading its data
What is the name of the variable you are loading? That is a fieldname in the structure kost. You access it using dot notation: ...

4 days ago | 0

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Extract X,Y data from scatter plot
Assuming you have a *.fig file and not a .png, first open the fig file in MATLAB then run the following code. s=findobj(gca,'Ty...

4 days ago | 0

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Array dimensions must match for binary array op.
The code runs just find for me. I don't have 'lake.tif', but I don't think that should matter. Try clearing your workspace or r...

4 days ago | 0

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Saving data in separate folders under different file names
I notice the lengh of the vector used for i is 90, but the length of Filename is 88. I suspect what is happening is that, when y...

4 days ago | 0

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Unrecognized variable x error
What is the value of n? The most obvious thing to me is that your for loop doesn't actually run, so x is never created. The lo...

4 days ago | 0

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How can I display the sum of the digits of a number entered by a user?
See this post.

7 days ago | 0

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Matlabonramp 13.2.
"Toggle" means to switch between to states (on/off, yes/no, in/out, show/hide, etc). A Further Practice section is an area to p...

7 days ago | 0

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Answered
plot 4 plots on 3 axes
Start by looking into yyaxis. As for adding a 3rd y-axis, see if this post helps.

9 days ago | 0

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Datevector conversion from Excel to Matlab
I would read them in this way: data = readtable('datevec_raw.xlsx','ReadVariableNames',false);

9 days ago | 0

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How can I to convert a cell to a double without losing the leading zeros?
I believe you would have to keep it a string in order to pad with zeros up front. See this post.

10 days ago | 0

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Adding latex text to a curve in a matlab plot
Try using the text function and set the 'Interpreter' name-vale pair to 'latex'.

10 days ago | 0

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App Designer - Button group
See this post.

13 days ago | 0

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How can I change my Matlab from Chinese to English on a Macbook with the latest version of Matlab
Does this link help?

14 days ago | 0

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Loading a VERY inconsistent data
When I look at your file, it looks to be fixed-width, but you seem to have two different data sets combined here. The indicator ...

14 days ago | 2

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How to open csv file?
There are many ways to import a csv file, including readtable textscan readmatrix csvread (not recommended) dlmread (not re...

14 days ago | 1

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comparing table values using isequal
This can be done much simpler. Try something like this. A = M(M{:,2}=="f",:);

15 days ago | 1

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How to solve "Unable to perform assignment because the indices on the left side are not compatible with the size of the right side" error?
x(j) is a single array element. You are trying to assign it 3 values, [dis0; phi0; theta0]. I'm unsure what the intent is, but o...

15 days ago | 0

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Answered
How can I count all occurances of each date in a DateTime Array?
I would look into groupsummary. Like Adam suggests, you'll need to remove the time portion for it to work as you intend. % Simp...

16 days ago | 1

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Answered
Is there a way to make the grid of latitude/longitude bolder when I use worldmap('World')
You could try something like this: % Code example with slight change (w=) w=worldmap('World'); load coastlines plotm(coastla...

16 days ago | 0

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Answered
About Matlab r2020a online
Not sure we can answer your question without knowing what is in the course and whether or not you have access to MATLAB Online. ...

18 days ago | 0

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Error: File: Lab1.m Line: 81 Column: 1 Function definitions in a script must appear at the end of the file. Move all statements after the "f" function definition to before the first local function definition.
What you have shared looks good, but you have not shared your full file (we do not see 81 lines, nor do we see a function f). As...

19 days ago | 0