MatLab at TU München

Flashcards and summaries for MatLab at the TU München

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Study with flashcards and summaries for the course MatLab at the TU München

Exemplary flashcards for MatLab at the TU München on StudySmarter:

how can you calculate the values of a matrix element by element?

Exemplary flashcards for MatLab at the TU München on StudySmarter:

logical indexing

find position of condition true

Exemplary flashcards for MatLab at the TU München on StudySmarter:

logical index:
answering withvaluesof condition (eg greater than threshhold)

Exemplary flashcards for MatLab at the TU München on StudySmarter:

vertical addition to a matrix

Exemplary flashcards for MatLab at the TU München on StudySmarter:

horizontal addition to a matrix

Exemplary flashcards for MatLab at the TU München on StudySmarter:

What du you have to do to get the sum of the rows?

Exemplary flashcards for MatLab at the TU München on StudySmarter:

the sum of a matrix
what is being calculated? rows or columns?

Exemplary flashcards for MatLab at the TU München on StudySmarter:

 indicate “all rows” (or “all columns”)

Exemplary flashcards for MatLab at the TU München on StudySmarter:

Access to single elements of the matrix

Exemplary flashcards for MatLab at the TU München on StudySmarter:

define a vector

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append string to string

Exemplary flashcards for MatLab at the TU München on StudySmarter:

display a string

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Exemplary flashcards for MatLab at the TU München on StudySmarter:

MatLab

how can you calculate the values of a matrix element by element?

A.*B <- Add a dot!!

MatLab

logical indexing

find position of condition true

» v = [5.8 7.1 6.2 8.3]
» threshold = 6.3;
» mask = v>threshold
mask = 0 1 0 1
» find(mask)
ans = 2 4

MatLab

logical index:
answering withvaluesof condition (eg greater than threshhold)

» mask = v>threshold
mask =   0 1 0 1

» v(mask)
ans = 7.1   8.3

MatLab

vertical addition to a matrix

C = [A; [1 2]]

MatLab

horizontal addition to a matrix

B = [A, [1; 2; 3]] 
or
B = [A, [1 2; 3 4; 5 6]]

MatLab

What du you have to do to get the sum of the rows?

sum(c)

MatLab

the sum of a matrix
what is being calculated? rows or columns?

sum(c)

-> Rows:
1 2 3
4 5 6
5 7 9

MatLab

 indicate “all rows” (or “all columns”)

colon “:”

» c(1, 🙂       ans = 1 2 3 4

» c(:,2)        ans = 2 6 

» c(:,2: 4)     ans = 2 3 4
                             6 7 8

MatLab

Access to single elements of the matrix

round brackets “()”:

MatLab

define a vector

a = [1 2 3 4]

MatLab

append string to string

s1=[ s ‘: hello!]

MatLab

display a string

disp(s)

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