for loop to go through a cell array

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C.G.
C.G. on 25 Nov 2020
Commented: C.G. on 25 Nov 2020
I have written a code which tells me how many particles go past a certain x-coordinate for a single time step. The code accesses one cell of a 710x1 cell array currently, but now I want to tell it to do this for all the cells in the array, so i can plot a particles vs. time graph.
I know I need another for loop to do this, but I am unsure how to tell it to go through all the cells in the array.
%% particles leaving the rice pile
%for each cell in the array (timestep), calculate the number of particles after a certain x coordinate
%access the {nth} cell of the cell array, and save all the rows in the 5th column (x-coordinates) as a new variable
xc = particledata{212}(:,5);
%use the function table2array to turn the format of the data from a table to an array
xc_array = table2array(xc);
%for all the rows in the array, if the x coordinate goes beyond the outlet
%of the rice pile, display 'grain left rice pile'
%-0.15 is the x coordinate for the outlet
ricepileoutlet = -0.15
for b = 1:size(xc_array,1)
if xc_array(b,1)< ricepileoutlet
disp('grain left rice pile')
end
end
%display how many grains in total left the rice pile in the time step
%add up the number of times the x coordinate is >0.188 and save this in a new variable 'grains'
grains=sum(xc_array(:,1)< ricepileoutlet);
fprintf('A total of %d grains left the rice pile\n',grains);

Answers (1)

KALYAN ACHARJYA
KALYAN ACHARJYA on 25 Nov 2020
Edited: KALYAN ACHARJYA on 25 Nov 2020
No loop needed here
% FOllowing result counts the total grain left rice pile
result=sum(xc_array>ricepileoutlet)
Note: Assumed that xc_array is an 1D array
  7 Comments
C.G.
C.G. on 25 Nov 2020
as you said above, xc_array is not a cell array.
my cell array containing all my 710 .csv files is 'particledata'
what I want to do overall is:
  • go through each cell of particledata and look at the data in column 5
  • for each of the cells in particle data, tell me if any of the rows in column 5 have values <-0.15, if so how many.
  • create a new variable called 'grains', which tells me how many rows have values <0.15 for each cell
  • plot a bar chart of grains vs. time

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