Sorting Column Variable to a Row

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Huw Wadkin
Huw Wadkin 2021-6-16
评论： Stephen23 2021-6-16
I have been given my data in 3 Columns of a table as depicted in the below screenshot (I have had to try and replicate a similar scenario using excel as I can't share the actual data):
and I wish to have it in this format for easier analysis/plots such as surface plots, with NaN is cells where there is no value for that date and category:
Any help would be appreciated.
Thanks,
Huw

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Stephen23
Stephen23 2021-6-16
编辑：Stephen23 2021-6-16
Ran in:
Do NOT use loops for this, the inbuilt tools are much better! First lets create some fake data in a table:
C = randi(6,30,1);
D = datetime(2021,1,randi(3,30,1));
T = unique(table(D,C),'rows');
T.V = randi([10,100],height(T),1)/10
T = 15×3 table
D C V ___________ _ ___ 01-Jan-2021 1 8.5 01-Jan-2021 2 6.6 01-Jan-2021 3 4.2 01-Jan-2021 4 1.6 01-Jan-2021 5 8.5 01-Jan-2021 6 8.9 02-Jan-2021 2 7.7 02-Jan-2021 3 3.7 02-Jan-2021 5 3.7 02-Jan-2021 6 1.6 03-Jan-2021 1 7.8 03-Jan-2021 2 5.8 03-Jan-2021 3 7.3 03-Jan-2021 4 3.7 03-Jan-2021 6 4.8
Rearranging how you requested is very easy with just one unstack command:
U = unstack(T,'V','C', 'VariableNamingRule','preserve')
U = 3×7 table
D 1 2 3 4 5 6 ___________ ___ ___ ___ ___ ___ ___ 01-Jan-2021 8.5 6.6 4.2 1.6 8.5 8.9 02-Jan-2021 NaN 7.7 3.7 NaN 3.7 1.6 03-Jan-2021 7.8 5.8 7.3 3.7 NaN 4.8
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Huw Wadkin
Huw Wadkin 2021-6-16
Thank you. I get an error for 'VariableNamingRule' saying invalid parameter name when I run your script? If I just do unstack(T,'V', 'C') it works. What do these options do?
Stephen23
Stephen23 2021-6-16
@Huw Wadkin: what options you have available depends on what MATLAB version you are using, which so far you have not told us. Use the local help of your installed MATLAB to know what options you can use.
"What do these options do?"
https://www.mathworks.com/help/matlab/ref/unstack.html#mw_36cb1afc-08c6-4dd3-af76-9107977f696e

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SALAH ALRABEEI
SALAH ALRABEEI 2021-6-16
编辑：SALAH ALRABEEI 2021-6-16
Assume your table ( without labels) is of size nx3; where the 1st col is your dates (in numbers), 2nd is your cat, and the 3rd is the values. See this example
x=[ 1 1 1 2 2 2 2 3 3];
y=[0:8];
z=round(100*rand(1,9));
D = [x;y;z]';
a=unique(D(:,1));
B=nan*ones(length(a),size(D,1));
for i = 1:length(a)
B(i,a(i)==D(:,1))=D(a(i)==D(:,1),3);
end

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