Fro questions about MATLAB's table data class.
Mathworks tables documentation
Questions tagged [matlab-table]
136 questions
22
votes
6 answers
Display matrix with row and column labels
Is there a convenient way to display a matrix with row and column labels in the Matlab terminal? Something like this:
M = rand(5);
displaymatrix(M, {'FOO','BAR','BAZ','BUZZ','FUZZ'}, ...
{'ROW1','ROW2','ROW3','ROW4','ROW5'}); …
nibot
- 14,428
- 8
- 54
- 58
4
votes
2 answers
Matlab equivalent of Python Panda's dtypes
If I have a pandas.DataFrame in python I can inspect the data types for the DataFrame with the dtypes attribute. How can I do the same with a Matlab table? I poked around the Properties mechanism but didn't find anything type oriented there.
jxramos
- 7,356
- 6
- 57
- 105
3
votes
2 answers
Representation of value class in table
If I have a value class like this:
classdef MyVal
properties
foo
end
methods
function self = MyVal(varargin)
if nargin > 0
self.foo = varargin{1};
end
end
end
end
and…
Patrick Happel
- 1,336
- 8
- 18
3
votes
1 answer
In Matlab, how to apply an 'AggregationFunction' with two variables in unstack?
Objective:
I would like to get, for each period and group of a timetable, the result of a given function of var1 and var2 [i.e. the ratio of (the sum of var1 over the group) by (the sum of var2 over the group)]
using unstack and a function…
Alexandre C-L
- 132
- 11
3
votes
1 answer
Unstacking multiple columns in Matlab
How do I unstack a data in matlab? The unstack for tables only allows me to do it for one column, and does not seem to be able to do a Multi Index solution as available in Python.
I was hoping to convert this:
into this:
in Matlab.
Here is code…
whisperer
- 587
- 7
- 13
3
votes
2 answers
Exploit Matlab copy-on-write by ensuring function arguments are read-only?
Background
I'm planning to create a large number of Matlab table objects once, so that I can quickly refer to their contents repeatedly. My understanding is that each table variable/column is treated in copy-on-write manner. That is, if a table…
user36800
- 2,019
- 2
- 19
- 34
3
votes
2 answers
How to join tables in Matlab (2018) by matching time intervals?
I have two tables A and B. I want to join them based on their validity time intervals.
A has product quality (irregular times) and B has hourly settings during the production period. I need to create a table like C that includes the parameters p1…
Schae
- 31
- 6
3
votes
1 answer
how to import a matlab table in R
I have a matlab .mat file with table data type which I want to import in R. I am using 'readMat' for this and R is reading it as a List.
After that is there a way to convert the list into either a dataframe or table format in R? When I use…
confused_certainties
- 389
- 1
- 3
- 10
3
votes
1 answer
Why does changing the Variable Name of a Table not work if it's the Property of a Class?
In the past, I've been making extensive use of Matlab's table class.
This very simple code, inside a script or at the prompt, works as expected:
varNames = {'Date_time', 'Concentration_1', 'Concentration_2'};
testTable = array2table(zeros(5,3),…
winkmal
- 622
- 1
- 6
- 16
3
votes
2 answers
Merge the content of two tables (looking for Matlab or Pseudo Code)
THIS QUESTION IS NOT ONLY FOR MATLAB USERS - If you know an answer to the problem in PSEUDOCODE, then feel free to leave your answer as well!
I have two tables Ta and Tb that have different number of rows and different number of columns. The…
WJA
- 6,676
- 16
- 85
- 152
3
votes
2 answers
How to rename only few variables in MATLAB table?
I want to generate a table but want to set the variable name of only one variable but want all other variables to keep their name.
Example,
say I have this data:
User1 = rand(5,1);
User2 = rand(5,1);
User3 = rand(5,2);
I can now make the table…
EkEhsaas
- 93
- 9
3
votes
2 answers
Automatically Create and Name Tables in Matlab from Excel Tabs
I have the following cell array which is a list of some (but not all) of the tab names in an excel file:
chosenTabs =
'Screen'
'SectorAbsolute'
'SectorRelative'
How do I get it to read off each tab of the excel sheet according to what is on this…
Mary
- 788
- 6
- 19
- 43
3
votes
4 answers
Test for existance of column in table Matlab
I Have the following table, T:
Hold Min Max
_________ ___ ____
0.039248 0 0.05
0.041935 0 0.05
0.012797 0 0.05
0.0098958 0 0.05
0.014655 0 0.05
How can I…
Mary
- 788
- 6
- 19
- 43
3
votes
1 answer
Faster Matlab Table Creation
I've noticed that creating fairly large tables in Matlab (>10,000 rows) can be quite slow because of a single function called by the constructor, checkDuplicateNames. However, I commonly am sure that the names I'm passing the table are already…
David Kelley
- 1,418
- 3
- 21
- 35
3
votes
1 answer
What is the best way to preallocate a table in Matlab?
Usually I preallocate using cell(), zeros() or ones() depending on the type of data, but what is the best way to preallocate a table as it can hold various data structures?
I am talking about the table() functionality added in Matlab…
florian
- 604
- 8
- 31