fill missing value in array

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michael
michael 2023-7-4
回答： KSSV 2023-7-4
Hi,
(unfortunatly, I have old matlab, where timeseries is not existing).
I have an array with data data_array, from which I have selected indeces K which I'd like to use.
I need to generate a new array dest_array , which will be with same length as the original one and populate values to it so that:
If I have selected index k (from K), the value dest_array[k]=data_array[k].
For all the missing enteries, I need to fill with values from previous known one.
What is the best way to do it?

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采纳的回答

KSSV
KSSV 2023-7-4
Ran in:
x = 1:100 ;
y = rand(size(x)) ;
% Introduce NaN's randomly
idx = randperm(100,20) ;
y0 = y ;
y(idx) = NaN ;
% Use interp1
yi = interp1(x(~isnan(y)),y(~isnan(y)),idx) ;
% compare
plot(y0(idx),'r')
hold on
plot(yi,'b')
legend('Original','filled')

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