Rik

Last seen: Today | Active 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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Math lab questions solve it
I will not do your homework for you, but these pointers should help you. doc for doc repmat % although you can do this part wi...

9 hours ago | 0

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Answered
Best hardware configuration for MATLAB
The questions on this forum are mostly answered by volunteers. If you want an official answer you should contact support. Apa...

1 day ago | 0

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Manually programmed GUI, guidata() not updating the handles struct
The guidata struct is not a global variable. You should treat it as a mat file. When you write to it, other functions need to re...

2 days ago | 0

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Please How I can get the figure like in the Picture below
You first need to define your variables: n=(1:1001); x=0.01*(n-1); y=0.01*(n-4); Now we have vectors, but you want the 2D gr...

6 days ago | 1

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Answered
Why does MATLAB differentiate between strings and character array data types?
Backwards compatibility. The string data type was introduced a few years ago (in R2016b) to introduce new features. Mathworks...

7 days ago | 0

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what dose [1: equations : 0] means in MATLAB?
In addition to the comment from Walter: Your question can be answered by two searches in the documentation: doc MATLAB Operato...

7 days ago | 0

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Remove white/blank space from plot
This answer will only work for raster images (so it will not work for eps). I use a pragmatic approach. I export in high resolu...

7 days ago | 0

Submitted

Wayback Machine API
This functions acts as an API for the Wayback Machine (web.archive.org).

8 days ago | 2 downloads |

Answered
Use workspace variable in equation solver
If you don't want to use a function to wrap the input, you can use an anonymous function instead. y=5; syms x eqn =@(y) x+y...

10 days ago | 0

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Can I run MATLAB (R2017 or newer) on a Lenovo Chromebook with an AMD A4 processor?
Probably not. You need a 64 bit OS to run Matlab (R2015b was the last release with an x86 version). Note that ARM64 only counts...

10 days ago | 0

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Answered
How do I keep my code and my variable editor in view at the same time
You can drag the menu bar around. You should see a blue outline showing you the result. I often use the variable viewer and edit...

10 days ago | 0

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Add and subtract matrix element consecutively
Since you already solved your own homework, I see no problem in providing you with some code. The main thing to remember is tha...

10 days ago | 0

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Answered
How can I select 20% of a given data set for training?
If you want the sample to be repeatable, you will need to specify the state of the random number generator by calling the rng fu...

11 days ago | 0

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How do I automatically delete a file after the variables needed has been extracted.
You can use delete directly on a specific file. But the question still stands. Generally you want to process data from one fo...

16 days ago | 0

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How do I make a state button's value change due to an auxillary app being closed?
There is a closereqfcn for the secondary window. That one should have access to the handle to the object in your main window. Th...

27 days ago | 1

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Store mxn matrix within a for loop
I'm not sure this is the optimal way to do it, but this does what you explain by using a cell array as an intermediary step. a ...

1 month ago | 0

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Matlab hidden optimization at the fifth execution
I personally use the ETA_disp function you can find here (or in the AddOn Manager). It only does naive averaging, instead of fan...

1 month ago | 0

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test for significance of assignment to groups
This doesn't sound like a Matlab question. It sounds to me like you need a Chi-square test.

1 month ago | 0

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How to count three pair of numbers in given matrix?
A simple loop should already do the trick. I can also come up with much more complex solutions. If you split your initial arr...

1 month ago | 0

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How to find the nearest matrix between two matrices?
Convert each row to a date format (either datetime or datenum). After that you can subtract one from the other, use abs and min...

1 month ago | 0

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Answered
Convert logical matix 3d to 2d with unknown z
The any function can do this for you: mask_result=any(masks,3)

1 month ago | 2

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How shall I sort along a dimension?
The sidebar showed this thread to me. It probably showed you a similar one before you posted this question. The solution is sim...

1 month ago | 0

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How to convert a 1x2 cell with 500x2 timetable to a 1000x2 timetable
I suspect this is what you need: data_table=vertcat(Out{:}); You should probably avoid the variable name table, since that may...

1 month ago | 0

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Answered
I need h help i save value in xlsx format through push button function
Because you used global variables instead of sharing data through the guidata struct, it is impossible to know what went wrong. ...

1 month ago | 1

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How do I open files from different subfolders?
There is presumably some structure or pattern to your files. You should use the dir function and make use of that pattern. The d...

1 month ago | 0

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Convert to fixed values and replace N/A with zero?
Perhaps the strrep function does what you need. data=readlines('https://www.mathworks.com/matlabcentral/answers/uploaded_files/...

1 month ago | 0

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jsondecode: preserve original string
If the jsondecode function does not mention this as an option, it is not possible without modifying the code, which you should n...

1 month ago | 1

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How to change the sign of some particular values in an array/matrix?
doc abs

1 month ago | 0

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Incorrect use of '=' operator. To assign a value to a variable, use '='. To compare values for equality, use '=='.
If you want to use the Name=Value syntax, you need to do this: meanBlink=rand;ltime=rand;detrend=rand;w=rand;f=rand;coi=rand;cy...

2 months ago | 0

Answered
Convert decimal and negative values to integers
Since all your values are between -1 and 1, you need a method to discretize your data to some arbitrary (but repeatable) indices...

2 months ago | 0

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