# Inserting missing rows to table for interpolation

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Sebastian Rehorst on 27 Mar 2023
Answered: Peter Perkins on 27 Mar 2023
Hello everyone,
I am trying to interpolate data with normally 25 data rows representing 25 data point times. I have 489 subtables and not every every table consists of 25 data rows. Now i want to insert rows of NaN into the subtables at specific rows. So that I can later interpolate the data by inserting the missing points.
For example: In subtable{3,1} are missing data point times of 6 an 10 and i want to insert a row of NaN at row 6 and row 10 while not overwriting the other values.
I tried creating 489 NaN-tables of 25x18 values with [:,1:17]=NaN and [:,18]=datatimepoints. Datatimepoints=[1;2;3;4;5;...;25]. Then I tried to write the subtable data into the NaN-tables in the corresponding rows. Here is the code:
NaN_Table=[];
for i=1:489
NaN_Table{i,1}= NaN(25:18);
NaN_Table{i,1}(:,18)=[1;2;3;4;5;6;7;8;9;10;11;12;13;14;15;16;17;18;19;20;21;22;23;24;25];
NaN_Table{i,1}=array2table(NaN_Table{i,1});
VarNames = subTables{1,1}.Properties;
NaN_Table{i,1}.Properties = VarNames;
end
for j=1:25
for i=1:489
x = table2array(subTables_{i,1}(j,18));
y = table2array(NaN_Table{i,1}(j,18));
if x == y
NaN_Table{i,1}(y,:) = subTables{i,1}(j,1:18);
end
end
end
Error using ()
Row index exceeds table dimensions.
Error in prostudy (line 82)
x = table2array(subTables{i,1}(j,18));
Makes sense to me bc some subTables do not have 25 rows of data. But I dont know how to extend the subtable data to 25 rows, bc they are different categories of datatypes (e.g. cell, categorical, datetime, double).

Peter Perkins on 27 Mar 2023
I'm not sure I follow your question, but it's almost certain that using timetables (maybe with durations as the row times) and synchronize or retime will solve it.

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