csvwrite

(Not recommended) Write comma-separated value file

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csvwrite is not recommended. Use writematrix instead. For more information, see Compatibility Considerations.

Syntax

csvwrite(filename,M)
csvwrite(filename,M,row,col)

Description

example

csvwrite(filename,M) writes matrix M to file filename as comma-separated values.

example

csvwrite(filename,M,row,col) writes matrix M to file filename starting at the specified row and column offset. The row and column arguments are zero based, so that row=0 and col=0 specify the first value in the file.

Examples

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Open Live Script

Create an array of sample data M.

M = magic(3)
M = 3×3

     8     1     6
     3     5     7
     4     9     2

Write matrix M to the file 'myFile.txt'. 

csvwrite('myFile.txt',M)

View the data in the file.

type('myFile.txt')
8,1,6
3,5,7
4,9,2
Open Live Script

Write a matrix to a file starting at a defined offset position.

Create an array of sample data M.

M = magic(3)
M = 3×3

     8     1     6
     3     5     7
     4     9     2

Define the starting offsets to skip one row and two columns. 

row = 1 ;
col = 2 ;

Write matrix M to the file 'myFile.txt', starting at the offset position. 

csvwrite('myFile.txt',M,row,col)

View the data in the file.

type('myFile.txt')
,,,,
,,8,1,6
,,3,5,7
,,4,9,2

Input Arguments

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File name, specified as a character vector or string.

Example: 'myFile.dat'

Data Types: char | string

Numeric data to write, specified as a matrix of numeric values.

Example: [1,2,3;4,5,6]

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | logical
Complex Number Support: Yes

Row offset, specified as a scalar. The row offset indicates the number of rows to skip before writing the numeric data. row is zero-based, so that row = 0 instructs MATLAB® to begin writing in the first row of the destination file. Skipped rows are populated with commas.

Column offset, specified as a scalar. The column offset indicates the number of columns to skip before writing the numeric data. col is zero-based, so that col = 0 instructs MATLAB to begin writing in the first column of the destination file. Skipped columns are separated by commas.

Limitations

  • csvwrite writes a maximum of five significant digits. If you need greater precision, use dlmwrite with a precision argument.

  • csvwrite does not accept cell arrays for the input matrix M. To export a cell array that contains only numeric data, use cell2mat to convert the cell array to a numeric matrix before calling csvwrite.

Algorithms

  • csvwrite terminates each line with a line feed character ('\n' or char(10)) and no carriage return.

Compatibility Considerations

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Not recommended starting in R2019a

See Also

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Topics

Introduced before R2006a

MATLAB Documentation

Support