how can I make the matrix empty when it has the values.
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this is my code.
if j~= p(t,1)
D{j}(i,[1,2,3,4])=Cl(i,[1,2,3,4]);
else
Cl(i,[1,2,3,4])% here is my problem I want C1 to be empty but I do not know how to write?!
end
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回答(1 个)
Walter Roberson
2017-9-18
You can delete values, and you can overwrite an entire matrix with an empty matrix, but you cannot overwrite part of a matrix with emptiness, unless the matrix is a cell array.
Cl(i,:) = [];
would delete all of row #i from C1.
c1(i,1) = [];
would delete just the element in column 1 of row #i. But as a side effect, because holes are not allowed in numeric arrays, the entire array would become a single column vector, the same as if you had done:
t = c1(:); %make it a column vector
t( sub2ind(size(c1), i, 1) ) = []; %delete the one element of the column vector
c1 = t; %that is the new c1
After that, there would be no c1(i,2) because it would be down to a single column.
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