Counting the number of elements of a vector found between a range in another vector

10 visualizaciones (últimos 30 días)
I have a column which contains a range of values in a column 'Range' and another vector containing specific values in a column 'entryTime'. How to output the number of elements found in column 'entryTime' within the column 'Range'.
Data is attached

Respuesta aceptada

Guillaume
Guillaume el 7 de Dic. de 2018
Frankly, the way you've stored your data is rubbish and making your work much harder.
Firstly, Your ranges shouldn't be stored as char arrays. It should be a 2 x numranges matrix or table.
Secondly, since the rows of Range have absolutely nothing to do with the rows of entryTime, they shouldn't be stored together in the same table. That would avoid pointless storing nans in entryTime if there are more ranges or god knows what as a filler in Ranges if there are more entryTimes.
So let's fix this:
ranges = regexp(data.Range, '([^-]+)-(.+)', 'tokens', 'once'); %plenty of other ways to split the data
ranges = array2table(str2double(vertcat(ranges{:})), 'VariableNames', {'lowerbound', 'upperbound'})
entryTimes = data(:, 'entryTime');
entryTimes(isnan(entryTimes.entryTime), :) = []
Then your problem is trivial:
rangecount = rowfun(@(l, u) sum(entryTimes.entryTime >= l & entryTimes.entryTime <= u), ranges, 'OutputVariableNames', {'count'})

Más respuestas (1)

TADA
TADA el 6 de Dic. de 2018
Editada: TADA el 6 de Dic. de 2018
If you keep your range data as two columns instead of strings you can easily do it
et = data.entryTime(~isnan(data.entryTime));
% split ranges by '-' character
rng = cellfun(@(str) strsplit(str, '-'), data.Range, 'UniformOutput', false);
% Unravel cell array and parse numbers
ranges = str2double(vertcat(rng{:}));
% find which entry times are within any of the ranges
entryTimesInRangeMask = arrayfun(@(t) any(t >= ranges(:,1) & t <= ranges(:,2)), et);
% output number of elements within any of the ranges
disp(['Number of entry times within range: ' num2str(sum(entryTimesInRangeMask))]);
  1 comentario
Hari krishnan
Hari krishnan el 7 de Dic. de 2018
Editada: Hari krishnan el 7 de Dic. de 2018
@TADA thank you very much. But this will give me the toral numbers of elements which falls between all the ranges. What i want to do is to calculate the number of elements in each independent range.
for eg: range = [0:5; 5.1:10; 10.1:15]
entries = [1, 2, 3, 4, 5, 11, 12]
Expected output: Number of entries in range "0:5" = 5
Number of entries in range "5.1:10" = 0
Number of entries in range "10.1:15" = 2

Iniciar sesión para comentar.

Categorías

Más información sobre Dates and Time en Help Center y File Exchange.

Etiquetas

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by