01:198:107 Lecture Notes - Lecture 19: Bracket, Delimiter, Row And Column Vectors
27 Apr 2018
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CS 107: Lecture 19: Cell arrays and text file I/O
● What is a cell array?
○ A cell array is a collection of containers called cells in which you can store
different types of data, like a matrix, strings, vectors, numbers
● Creating a cell array
○ A(1,1)={[1 4 3; 0 5 8; 7 2 9]}
○ A(1,2)={‘Anne Smith’};
○ A(2,1)={3+7i};
○ Matlab will display the sizes of sub-structures or the substructure itself
● Nesting one cell array in another
○ header={‘Name’, ‘Age’, ‘Pulse/Temp/BP’};
○ records(1,:)={‘Kelly’,49,{58,98.3,[103,72]}};
○ Header,records
○ header=’Name’ ‘Age’ ‘Pulse/Temp/BP’
○ records=’Kelly’ [49] {1x3 cell}
● Building a cell array in steps
○ vitalsigns={60, 98.4, [105,75]};
○ records(1,:)={‘Kelly’, 49, vitalsigns}
○ records=’Kelly’ [49] {1x3 cell}
● Alternative assignment syntax
○ A(1,1)={[1 4 3; 0 5 8; 7 2 9]);
○ A(1,2)={‘Anne Smith’};
○ Or
○ A{1,1}=[1 4 3; 0 5 8; 7 2 9];
○ A{1,2}=’Anne Smith’;
● Concatenating cell arrays
○ There are two ways that you can create a new cell array from existing cell
arrays
■ C={C1,C2} - concatenate entire cell arrays to individual cells of the
new array using curly brace {} operator
Document Summary
Cs 107: lecture 19: cell arrays and text file i/o. A cell array is a collection of containers called cells in which you can store different types of data, like a matrix, strings, vectors, numbers. A(1,1)={[1 4 3; 0 5 8; 7 2 9]} Matlab will display the sizes of sub-structures or the substructure itself. A(1,1)={[1 4 3; 0 5 8; 7 2 9]); A{1,1}=[1 4 3; 0 5 8; 7 2 9]; There are two ways that you can create a new cell array from existing cell arrays. C={c1,c2} - concatenate entire cell arrays to individual cells of the new array using curly brace {} operator. C=[c1 c2] - concatenate the contents of the cells into a new array using the bracket [] operator. C2={ mar" apr" may"; 31" 2" 10"; . Reading a text file into a cell array.
