compare cell array elements with non zero elements in 2D array
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hey i have cell array containing multiple elements e.g.
x{1,1}={2;1}
x{2,1}={1;[1;2]}
and a 2D array:
y=[0,0,-1,1,0,0;-1,0,1,-1,0,0]
for x{1,1}{1,1}=2, it will consider 1st non zero column value (e.g. 3 in 1st row is first non zero column index ) in 1st row of y, and in 2nd row(As x{1,1}{1,1}=2), it will check what value is placed at that non zero index and store it in another cell array. for x{1,1}{2,1} it will consider 2nd non zero element of 1st row.
for x{2,1}{1,1}=1, it will consider 2nd row and check which 1st non zero element.
采纳的回答
I assume you've made a mistake with your example result. How can you have 0 in the outptu if you only look at the non-zero values. Also, the first non-zero value in row 1 is -1, so I assume that result{1}{2} should be -1.
If so:
result = cell(size(x));
for row = 1:size(x, 1)
ynonzeros = nonzeros(y(row, :));
result{row} = cellfun(@(cols) ynonzeros(cols), x{row}, 'UniformOutput', false);
end
Because of the need of the temporary ynonzeros it's not possible to replace the outer loop with an arrayfun with an anonymous function, as I had in my previous answer.
5 个评论
Tha saliem
2017-4-13
编辑：Tha saliem
2017-4-13
hey. Thankyou for your help. sorry for not clarifying my question Actually what i want to do is that for example i have y like this:
and elements of x{1,1} are:
x{1,1}{1,1}=4
x{1,1}{2,1}=4
it will take first element of x{1,1} which is 4 and this 4 will indicate the row to be used in y matrix. and also as it is first element of x{1,1} it will consider 1st non zero element of 1st row in y. It means value at column 3 of row 1 will be considered. Now it will check value which is present at 3rd column of 4th row and will display result.
for x{1,1}{2,1}=4, it will consider 2nd non zero element of 1st row in y. and will display value present at 4th column of 4th row.
Tha saliem
2017-4-13
Tha saliem
2017-4-13
Guillaume
2017-4-13
result = cell(size(x));
for row = 1:size(x, 1)
ycols = find(y(row, :));
result{row} = arrayfun(@(r) y(x{row}{r}, ycols(r)), ....
(1:numel(x{row})).', ...
'UniformOutput', false);
end
Tha saliem
2017-4-13
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