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# Rik

##### Last seen: Today
1.657 total contributions since 2017

E-mails with feedback/questions about FEX submissions are welcomed. In general I will post e-mails about Answers on the related page, unless there is good cause not to do so.

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Why won't matlab plot data from a table?
You're trying to plot a scalar multiple times, which Matlab happily does for you. You won't see anything, because your line styl...

alrededor de 6 horas ago | 0

Why is this so slow?
Loops with many elements are slow. You also forgot to properly pre-allocate s. N = 10^5; a = 0; b = 4; r = a + (b-a)*rand(N,...

alrededor de 6 horas ago | 2

In general you can use the student version for as long as you are a student. Note that officially you can only use the student v...

1 día ago | 0

campare a row value with the next row
You were close when using diff. You need to think what characterizes all four combinations. The code below should be what you ne...

1 día ago | 1

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Pass variables from callbacks to custom functions in a GUI
I'm going to assume the error occurs at this line guidata(app, handles); You are mixing a GUIDE-style GUI syntax with an AppDe...

1 día ago | 0

How to Turn Imagesc to x and y?
You can generate the coordinates with ndgrid and then you can linearize the three matrices and use them as input to plot3. ...

2 días ago | 1

How do I sum the outputs of a for loop?
Create a variable before the loop and set it to 0. Inside the loop you can add the value of Winnings to this variable.

3 días ago | 0

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creating new matrix from remaining of existing 2 matrices
Use ismember with the rows switch to find the rows in A that exist in B, flip this logical vector with ~ and use the result to i...

4 días ago | 0

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Error due to matrix dimensions not being consistent
You have shadowed the internal function mtimes which is used when you use the * operator. Renaming your function should solve th...

4 días ago | 0

how to assign certain range of pixel values with desired color for classification of image?
What you need to do is replicate your grayscale image to three channels to make it an RGB image. Then you can modify the the col...

6 días ago | 1

Add a box with error metrics in plot
You can add information to a plot with an annotation, or you can use the rectangle and text functions. The code below will read ...

8 días ago | 0

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Run cmd command from MATLAB
You should not set the PATH, but you should use cd instead to change the directory inside your system call. I personally pre...

9 días ago | 0

remove zeros from a 15x300 matrix and find the median
You can use this inside your loop. AS_V(i)= median(AS(AS~=0));

10 días ago | 0

Generate row vectors that match indexes
The code below will sample points over a parabola, since three points fully determine a second order polynomial. The middle poin...

15 días ago | 0

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How can I count the number of times a value occurs
You can use bwlabeln to label all your non-zero regions. then you can loop through each of the labeled regions to determine whic...

15 días ago | 0

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How to set value in a matrix
This was a fun puzzle. I believe the code below is one of the many possible solutions. It does use implicit expansion, so for pr...

16 días ago | 3

Why the line is not shown in the graph?
You are not indexing the trans variable inside your loop, which results in you overwriting the value every loop iteration. That ...

16 días ago | 0

how to plot smooth line plot?
The code below generates some example data and then interpolates the data in the loglog domain. %generate some example data X=...

16 días ago | 0

You are reusing i as a loop index multiple times. The mlint also warns you about that. It is a good idea to resolve all warnings...

17 días ago | 0

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How to close the figure contain the uifigure after the alert is closed?
The figure you specify does not actually contain the alert. The function only requires an input to determine where the alert box...

17 días ago | 1

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Adjust intervals of x-axis in the plot!
You can directly set the tick locations with the xticks function. Since your variable is already a datetime (and not datenum), y...

17 días ago | 1

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Vector averaging with mean command
A faster method than a for-loop is using movmean and throwing out the results you don't need. This will also take care of the ca...

19 días ago | 1

Submitted

isnetavl
Check for an internet connection by pinging one of Google's DNSes

Does matlab have any function that can compare multiple numbers and return logical value zero or one?
Another of the many strategies: count the number of elements a unique() call gives you. (when I'm back at a computer I'll test t...

21 días ago | 0

how to plot roc curve.....
Given your data, this is the ROC curve. In general the code below is added, but that is optional. hold on, plot([0 1],[0 1]...

21 días ago | 0

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While loop - Factorial
You need to repeat the exact same code until some condition is true. The easiest way to do that is with a while loop: n=-1;%set...

21 días ago | 0

create a input dialog with text entry and also drop down menu
The easiest is probably to create a tiny GUI. More general tips can be found here, but the basic idea is something like the code...

21 días ago | 1

Is there an error in the code?
You haven't converted the number to a date yet and you had a typo in your variable name. Also, 1998/01/01 was a Thursday. Day =...

21 días ago | 0