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engineering mat lab

Test Your MATLAB Knowledge for the MathWorks Certified MATLAB Associate Exam

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)

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)

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} = {[]};

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])

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)

技能: 矩阵及数学软件

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