1. Which command will return the corner elements of a 10-by-10 matrix A? A. A([1,end], [1,end]) B. A([1,1], [end,end]) C. A({[1,1], [1,end], [end,1], [end,end]}) D. A(1:end, 1:end) 2. Which command will return the fraction of positive numbers in a 10-by-10 matrix A? A. A(A > 0)/A B. numel(A > 0)/numel(A) C. sum(A > 0)/prod(size(A)) D. nnz(A > 0)/numel(A) 3. Which command will delete (completely remove) the last cell of a cell-array C? A. C{end} = []; B. C[end] = []; C. C(end) = []; D. C{end} = {[]}; 4. Which command will create a plot of acceleration vs. time (i.e., a vector time on the x-axis and a vector acceleration on the y-axis)? A. plot(time, acceleration) B. plot(acceleration, time) C. plot([time, acceleration]) D. plot([acceleration, time]) 5. Which command will give the standard deviation for each column in a 10-by-5 matrix Z? A. std(Z(:)) B. std(std(Z)) C. std(Z(1:5, :)) D. std(Z) How to answer above questions based on Matlab!
1. Which command will return the corner elements of a 10-by-10 matrix A?
A. A([1,end], [1,end])
B. A([1,1], [end,end])
C. A({[1,1], [1,end], [end,1], [end,end]})
D. A(1:end, 1:end)
2. Which command will return the fraction of positive numbers in a 10-by-10 matrix A?
A. A(A > 0)/A
B. numel(A > 0)/numel(A)
C. sum(A > 0)/prod(size(A))
D. nnz(A > 0)/numel(A)
3. Which command will delete (completely remove) the last cell of a cell-array C?
A. C{end} = [];
B. C[end] = [];
C. C(end) = [];
D. C{end} = {[]};
4. Which command will create a plot of acceleration vs. time (i.e., a
A. plot(time, acceleration)
B. plot(acceleration, time)
C. plot([time, acceleration])
D. plot([acceleration, time])
5. Which command will give the standard deviation for each column in a 10-by-5 matrix Z?
A. std(Z(:))
B. std(std(Z))
C. std(Z(1:5, :))
D. std(Z)
How to answer above questions based on Matlab!
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