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Cris LaPierre


Last seen: 1 day ago

MathWorks

2,092 total contributions since 2018

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Answered
wrong matrix - provides 3x3 instead of 3x1
Follow the dimensions of your variables to track it down. Q_bar{k} is 3x3 Q_bar{k} = inv(T).*Q.*T where Q and T are 3x3 shear...

18 hours ago | 0

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how to plot polyfit same plot as scatter
Look at some of the examples on the polyval documentation page. Polyfit just returns the coefficient values. If you want to plo...

18 hours ago | 0

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[Beginner] Constructing a rectangle object and detecting points inside
Independently, I'd suggest the rectangle and inpolygon functions. However, to find the points inside the rectangle, I'd use patc...

18 hours ago | 1

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In table, how to select values in one column based on values in another column?
The simplest way to do this is using logical indexing, but that doesn't preserve the order. That makes it a more challenging pro...

18 hours ago | 0

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Selecting part of data that satisfies a criterion
You seem to be taking the correct approach. Perhaps the most helpful thing to point out is this page on how to access data in a ...

21 hours ago | 0

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Answered
Algorithm that identifies the number of time steps in which a matrix has certain values?
If you use a live script, you also can develop your own algorithm to find the points you want interactively using the Find Local...

22 hours ago | 0

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Marker color on web browser matlab
Have you looked at the Color section of the wmmarker documentation page? Color must use the convention explained on the Colorsp...

1 day ago | 0

Answered
Help!: int(expr,var) function returns the int(expr,var) function
That likely means it couldn't solve that one. Consider using one of the techniques mentioned in these two examples. Unevaluate...

1 day ago | 0

Answered
How to make lines plotted as dots for discontinuous data more visible in legend?
As I'm sure you are aware, a legend matches the formatspec of the corresponding line object. Since you plot without a line, your...

1 day ago | 2

Answered
Index exceeds the number of array elements(3)
We can't run your code. We need your closetozeroroundoff function. However, the error message isn't about whether or not there ...

1 day ago | 0

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Unrecognized function or variable 'visadevlist'.
These functions are part of the Instrument Control Toolbox. You need to have that toolbox installed in order to use these functi...

1 day ago | 0

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How to access output variables from a m.file in another?
If the variables exist in your workspace, you can use them in any script. Consider having one script that organizes your data ...

2 days ago | 0

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Where is the problem with this code?
Inspect your response variable. It apparently has the wrong data type. If you don't yet know how to create categorical data, se...

3 days ago | 0

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Solving a first order differential equation
See this example. I've copied/modified the relevant parts below. syms y(t) Dy = diff(y,t); cond = Dy(2)==3; ySol(t) = dsolve...

3 days ago | 1

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Answered
Correction of misspelled words in data source
If you are using extractAfter, your data must be text. If so, have you tried using the replace function? data = ["Signal1: 5, S...

4 days ago | 0

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How to read text header data from a csv file along with numerical data
Use readtable with VariableNamingRule set to true. Then extract the data you need from the table. T = readtable('test.csv',"Var...

4 days ago | 0

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STILL confused on Solver (tried a different approach) NOT SPAM
Assuming x is symbolic %feed composition z1=.5; z2=.1; z3=.15; z4=.25; %other given data F=150; PD=250; T=10; sy...

5 days ago | 0

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How do I plot one legend item for multiple plots?
One approach I can think of is to check even/odd before you plot, and use line objects to control what is placed in the legend. ...

5 days ago | 1

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Answered
error at for loop end (courseera course ref. solution- fixed points Lorentz equations)
I wonder if the variable b defined in the first line is supposed to be beta. However, changing that just led to a new error. If...

5 days ago | 0

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Unable to detect datetime or duration data using readtimetable with a seconds index
The issue appears to be that seconds get written in a format that MATLAB cannot read back in. The only supported input formats f...

5 days ago | 0

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Answered
Setting default XLimitMethod not working
That would explain it. This appears to be a new property that was added in R2021a. https://www.mathworks.com/help/matlab/ref/ma...

5 days ago | 0

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Answered
2D line graph plotting from calculations
Right now, each loop replaces the previous variable values with the new values. Insteach, you need to capture the result of each...

5 days ago | 0

Answered
Return field in struct whose field name contains a string
One way is to use the functions fieldnames and contains. Struct.Data.FieldOne =1;%1000x2 double Struct.Data.FieldTwo =2;%1000x...

5 days ago | 0

Answered
graphing x as a function of y, y as a function of x in one plot
You would benefit by going through MATLAB Onramp. Ch 3 covers creating vectors and matrices Ch 6 covers array calculations (el...

5 days ago | 0

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How to retrievre the code that generates a figure?
Unfortunately, no, information on which file was used to create a figure is not captured. Perhaps you could use Date Created and...

6 days ago | 0

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Answered
Error using string concatenation as input to ordinal( ) function
There is a warning at the top of the documentation page for ordinal The nominal and ordinal array data types are not recommende...

6 days ago | 0

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Answered
Vectors not the same length
If there are less items in Speed then Time, then your if statement should use length(Speed) instead. However, that may not alway...

6 days ago | 0

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Name timetable values based on datetimes defining time range
You may find the page Access Data in a Table helpful.

6 days ago | 0

Answered
Heatmap from Array For data set
If you want to keep everything as vectors, you will need to turn your array into a table with at least 3 variables. Then create ...

6 days ago | 0

Answered
How to show multiple lines in the legend?
You are replacing the legend each time. Use the loop to build up your labels, but don't atually create the legend until you exit...

6 days ago | 0

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