Podcast
Questions and Answers
The clear command removes all variables from the workspace.
The clear command removes all variables from the workspace.
True
The clear command saves all variables to a file.
The clear command saves all variables to a file.
False
The clear command is used to create new variables.
The clear command is used to create new variables.
False
The clear command removes only temporary variables from the workspace.
The clear command removes only temporary variables from the workspace.
Signup and view all the answers
The clear command can be used to remove individual variables.
The clear command can be used to remove individual variables.
Signup and view all the answers
The min function returns the minimum value of the entire matrix.
The min function returns the minimum value of the entire matrix.
Signup and view all the answers
The magic function produces valid magic squares for all N>0.
The magic function produces valid magic squares for all N>0.
Signup and view all the answers
The inv function returns the inverse of a vector.
The inv function returns the inverse of a vector.
Signup and view all the answers
The diag function returns the diagonal of a matrix.
The diag function returns the diagonal of a matrix.
Signup and view all the answers
The prod function returns the product of the elements of a matrix.
The prod function returns the product of the elements of a matrix.
Signup and view all the answers
The median function returns the median value of the elements of a matrix.
The median function returns the median value of the elements of a matrix.
Signup and view all the answers
The min function returns a scalar value.
The min function returns a scalar value.
Signup and view all the answers
The magic function produces a magic square for N=2.
The magic function produces a magic square for N=2.
Signup and view all the answers
The prod function returns a scalar value for matrices.
The prod function returns a scalar value for matrices.
Signup and view all the answers
The diag function returns a vector if the input is a vector.
The diag function returns a vector if the input is a vector.
Signup and view all the answers
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
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
This quiz covers the functionality of the clear command in MATLAB, including its effects on variables in the workspace.
