# Cris LaPierre

### MathWorks

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**Content Feed**

How to plot quivers only on pixels with an intensity greater than 0?

quiver will not plot nan, so a simple solution may be to replace any value of 0 with nan. U(U==0)=nan; V(V==0)=nan; quiver(X,...

10 hours ago | 1

| accepted

what function should I use in order for the matlab to evaluate the entered number if it is proper fraction, improper fraction, or Whole number?

You appear to be using MATLAB Grader, which does not support user interactions like input. You will need to find a different way...

12 hours ago | 0

I am getting an error Index exceeds the number of array elements in the following code. Kindly help me out with this problem.

We don't have enough information to tell you which variable is causing the problem. However, one of your variables has less than...

13 hours ago | 0

Convert list of indices to array

You should be able to use the reshape command on the 4th column % Setup your matrix syms e31 e15 e32 e24 e33 a= [1, 1, 1, 0...

13 hours ago | 1

| accepted

Parse Error, usage might be invalid MATLAB Syntax

All functions must be at the bottom of your script. See here: https://www.mathworks.com/help/matlab/matlab_prog/create-function...

1 day ago | 0

changing values in an array

See Ch 5 of MATLAB Onramp (Indexing into and Modifying Arrays). You will also find Ch 12 (Logical arrays) helpful for what you ...

1 day ago | 0

| accepted

Unable to Rename Columns of Table

The reason the first one isn't working is because you have a typo. Look at how you spell eclipses ecplises = ... eclipses.Prop...

2 days ago | 1

creating line plot with different marker color and legends

Your data is a row vector (1xn) but you are indexing it like it is a column vector (mx1). Since it is a vector, perhaps it is be...

3 days ago | 0

| accepted

set axes limit manual

Ah, you actually meant 11x11 and 20x20. I had figured that was just a typo based on the question. imagesc is going to use row nu...

3 days ago | 0

set axes limit manual

Can you share your code? It sounds like you are not providing an x input to your plot command. If not, MATLAB is using the index...

3 days ago | 0

Grader says answer Verified in Reference Solution is wrong

It doesn't appear that you've shared all your code, as I get an error about n being undefined. Obviously, that will be true for ...

3 days ago | 0

If values are given then how we used in loop one by one .

Ch 13 of MATLAB Onramp explains how to create and use for loops in MATLAB. You can also find some examples here. Basically, p...

3 days ago | 0

how to solve the error "Unrecognized function or variable ".

The error suggests your code either can't find a function you use (it is not in the current folder or on the MATLAB path), or yo...

4 days ago | 0

| accepted

Re-write a Data from File (Readtable, Readmatrix, etc) with a replacing rule for a specific data number(s)

If you are already using readtable, look into the TreatAsMissing name-value pair input argument. You might also consider the st...

4 days ago | 0

| accepted

Not enough Input Argument error

CountryData is a class. I believe you need to create an instance of your object and then use that when calling your method. See ...

4 days ago | 0

How to divide a vector by a constant?

You need to use elementwise division everywhere in your equation for y c=3*10^8; speeds=(.1*c:.9*c/8:.9*c); % v y=1./sqrt(1...

4 days ago | 1

Convert table sequence to csv

Have you tried writetable? seqTable = load('matlab.mat'); writetable(seqTable,'test.csv');

5 days ago | 0

Storing results of variables into arrays in App Designer

Make your variables properties of the app. See this page: https://www.mathworks.com/help/matlab/creating_guis/share-data-across...

6 days ago | 0

Getting error as array indices must be positive integers or logical values in slope calculation.

I suspect the error is in your column index for R: ji-1 When ji=1, the result is 0, which is not a valid index in MATLAB. Not...

6 days ago | 0

| accepted

How to open the DDS Blockset app?

Do you have the DDS Blockset installed? Type ver in the command window to see. If not and you have access to it through your l...

6 days ago | 0

| accepted

MATLAB Fundamentals course erased all progress

Progress is tied to the course release. It is possible you are now accessing a different release version. Try changing your rele...

6 days ago | 1

Displaying an image in app designer

Use the following syntax: imagesc(ax,___) where ax is your target axes (app.UIAxes). You connect it to your button by placing ...

6 days ago | 0

| accepted

Using a Checkbox to add/ remove Text in contourplot in Appdesigner

You need to use the handle to your contour plot to set the property of ShowText to on or off. [x,y,z] = peaks; [C,h] = contour...

6 days ago | 1

| accepted

How to plot power lines on the motor torque and speed graph

Do you know about hold? If so, I'm not sure I understand why you can't plot them. Your x vector is the speeds, and your y vector...

6 days ago | 0

Multiple lines to write using fid open

The issue is with the permission you are using with fopen ('w'). 'w' Open or create new file for writing. Discard existing co...

6 days ago | 0

| accepted

How do we start numbered lists in the Live Editor (i.e. in a live script) from a different number?

I do not believe this is currently possible in live scripts, but is a good suggestion. I recommend submitting this as a suggesti...

6 days ago | 0

Keep getting "too many input arguments"

Methods are called just like functions, with the object passed in as one of the arguments. Try this: a = lm25119_calcs; HsFETl...

6 days ago | 0

| accepted

error in axis! help me

As the error states, you have an unexpected number of values in your axis command. For a 2D plot, you should have 4. Since I don...

6 days ago | 1

Extracting value from Name-Value pairs using the Name string

ind = strcmp({test.Name},'long_name'); test(ind).Value

7 days ago | 1

| accepted