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Razvan Carbunescu

MathWorks

Last seen: 4 years ago |  Active since 2018

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Answered
How can I count the occurrences of each element in a vector in MATLAB?
There is a simpler way of answering this now using groupcounts(R2019a) or grouptransform(R2018b): >> x=[10 25 4 10 9 4 4]'; ...

5 years ago | 6

Answered
using acummarray to average several columns at a time?
There's a simpler way of doing this with groupsummary I imported the sampledata and made the table with 7 columns: Year,Month,...

6 years ago | 4

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Answered
Divide table in days and then in hours.
Depending on the final goal here could use some of the functionality within <https://www.mathworks.com/help/matlab/ref/groupsumm...

6 years ago | 1

Answered
How to use accumaray to aggregate text/string based?
<https://www.mathworks.com/help/matlab/ref/accumarray.html accumarray> is for numerics only but if |c| is going to only be singl...

6 years ago | 0

Answered
matrix multiplication speed calculation
Matrix multiplication (GEMM) is one of the heavily optimized methods and when operating on larger inputs more optimizations, blo...

6 years ago | 3

Answered
Replacing NaN with the average of previous and next cell value
This sounds like a use for <https://www.mathworks.com/help/matlab/ref/fillmissing.html fillmissing> with linear option: >> ...

6 years ago | 1

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Answered
How to find "maximum" value in a table
Can accomplish this easier with indexing >> T = readtable('test1.txt'); >> [~,maxidx] = max(T.SPmin); >> T(maxidx,:) ...

6 years ago | 2

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Answered
How to output specific rows from tables depending on values within the table?
If you're using R2018a and only interested in maximum JumpHeight can use <https://www.mathworks.com/help/matlab/ref/groupsummary...

6 years ago | 1

Answered
Daily average precip for many years
An alternative if using R2018a is <https://www.mathworks.com/help/matlab/ref/groupsummary.html groupsummary>, it has a few diffe...

6 years ago | 1

Answered
How to get cumulative sum in yearly buckets
If using R2018a and wanting the final sum each year only can use <https://www.mathworks.com/help/matlab/ref/groupsummary.html gr...

6 years ago | 0

Answered
Subdivide group of data
If using R2018a you can compute the data easier by using <https://www.mathworks.com/help/matlab/ref/groupsummary.html groupsumma...

6 years ago | 0

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Answered
Accumarray help: extracting matrix min/max based on values in first column.
For this case the type of the data is probably what is giving you the problem. In R2018a you can use <https://www.mathworks....

6 years ago | 1

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Answered
smoothing data
The issue in your code is the fact that veldata has 1 less elements than posdata because of the diff command. If you add a 0 to ...

6 years ago | 0

Answered
find duplicate values using accumarray() function:
Using <https://www.mathworks.com/help/matlab/ref/accumarray.html accumarray> specifically you could do this by combining with <h...

6 years ago | 1

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Answered
What am I doing wrong with the function 'topkrows'
topkrows was initially introduced in R2016b as a function for tall arrays and tables only. In R2017b the functionality was ad...

6 years ago | 0

Answered
Data Analysis: Can I compare and match timestamps?
I think you are looking for something like <https://www.mathworks.com/help/matlab/ref/table.join.html join> or <https://www.math...

6 years ago | 0

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Answered
find the number of elements in matrix
If using R2018a can use <https://www.mathworks.com/help/matlab/ref/groupsummary.html groupsummary> with the first syntax: G...

6 years ago | 0

Answered
How to seperate the scattered population in three broad groups
In addition to the suggestion above, if you are looking for a way to automate the process of splitting the data could look at th...

6 years ago | 0

Answered
ODE45 help varying values
The height of the answer is the number of timesteps needed to compute the solution. The a=1, b=2 solution takes more steps to ...

6 years ago | 0

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Answered
how to convert hourly average into monthly??
If using R2018a and the data lives in a table T with variables 'Time' and 'Data' can accomplish this by using the new <https://w...

6 years ago | 0

Answered
For loop mean values into matrix
You can use a <https://www.mathworks.com/help/matlab/ref/groupsummary.html groupsummary> command in R2018a but have to convert i...

6 years ago | 1

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Answered
Get means for nested categorical variables
Can also use <https://www.mathworks.com/help/matlab/ref/groupsummary.html groupsummary> to compute directly one go from T: ...

6 years ago | 1