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Questions and Answers
The clear command removes all variables from the workspace.
True
The clear command saves all variables to a file.
False
The clear command is used to create new variables.
False
The clear command removes only temporary variables from the workspace.
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The clear command can be used to remove individual variables.
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The min function returns the minimum value of the entire matrix.
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The magic function produces valid magic squares for all N>0.
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The inv function returns the inverse of a vector.
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The diag function returns the diagonal of a matrix.
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The prod function returns the product of the elements of a matrix.
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The median function returns the median value of the elements of a matrix.
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The min function returns a scalar value.
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The magic function produces a magic square for N=2.
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The prod function returns a scalar value for matrices.
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The diag function returns a vector if the input is a vector.
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Study Notes
clear Command
- The clear command removes all variables from the workspace.
- It does not save variables to a file, nor is it used to create new variables.
- The clear command does not remove only temporary variables from the workspace.
- It can be used to remove individual variables.
Working with Matrices
- Matrices in MATLAB can be created using square brackets
[], for example,x = [1 2 3; 4 5 6];
Summation
-
sum(x)returns the sum of the elements ofxas a row vector with the sum over each column -
sum(x,2)sums along the dimension2(i.e., sums each row) - To find the sum of elements stored in a matrix with
ndimensions, usesumcommandntimes in cascade form
Mean
-
mean(x)returns the average of the elements ofxas a row vector with the average over each column -
mean(x,2)averages along the dimension2(i.e., averages each row) -
mean(mean(x))can be used to find the overall mean of a matrix
Creation of Matrices
-
zeros(N)produces anNbyNmatrix of zeros -
zeros(N,M)produces anNbyMmatrix of zeros -
ones(N)produces anNbyNmatrix of ones -
ones(N,M)produces anNbyMmatrix of ones
Matrix Indexing
-
A(1,4)refers to the element in the first row and fourth column of matrixA -
A(1,4) + A(2,4) + A(3,4) + A(4,4)can be used to compute the sum of the elements in the fourth column ofA -
sum(A(:,4))can also be used to compute the sum of the elements in the fourth column ofA
Colon Operator
- The colon
:is a powerful operator in MATLAB -
1:10returns a row vector containing the integers from 1 to 10 -
100:-7:50returns a row vector containing the integers from 100 to 50 in decrements of 7 -
A(1:k,j)returns the firstkelements of thejth column ofA -
A(4,:)returns the entire fourth row ofA
Basic Matrix Functions
-
min(x)returns the minimum value of the elements ofx -
min(min(x))returns the minimum value of the minimum values of each column ofx -
magic(N)produces anNbyNmagic square -
inv(x)returns the inverse of matrixx -
diag(x)returns the diagonal of matrixx -
prod(x)returns the product of the elements ofxas a row vector with the product over each column -
median(x)returns the median value of the elements ofx
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Description
This quiz covers the functionality of the clear command in MATLAB, including its effects on variables in the workspace.
