csvWrite

Arguments

filename

a string: the file path.

M

a m-by-n matrix of strings or double (complex supported).

separator

a string: the column separator mark.

decimal

a string: the decimal mark, either "." or ",".

precision

a string: the C format.

header

a vector of text: the header written as a column of text at the beginning of the file, before actual data.

Description

This function writes matrix M into filename as comma-separated values.

The default value of the optional input arguments are defined by the csvDefault function.

Any optional input argument equal to the empty matrix [] is set to its default value.

If the file filename already exists, it is overwritten.

If relevant (ie with 'special' characters), the file will be saved as UTF-8.

Examples

In the following example, we combine the csvWrite and csvRead functions.

// Save a matrix as csv file format
M = [1:10] * 0.1;
filename = fullfile(TMPDIR, "data.csv");
csvWrite(M, filename);

// Read as text
mgetl(filename)

r = csvRead(filename);

In the following example, we use various options of the csvWrite function.

// Save a matrix as csv file format
M = rand(2,3);
filename = fullfile(TMPDIR, "data.csv");
//
// Use tabs as the separator
csvWrite(M, filename,ascii(9));
mgetl(filename)
//
// Use the "," as the decimal point
// (and blank space as the separator).
csvWrite(M, filename," ",",");
mgetl(filename)
//
// Configure the precision.
// Caution: this lower precision may generate
// errors in a write-read cycle!
csvWrite(M, filename,[],[],"%.8e");
mgetl(filename)
//
// Configure the header
header = [
"// Copyright (C) INRIA"
];
csvWrite(M, filename, [], [],[], header);
mgetl(filename)

The following examples are more advanced uses of the csvWrite function.

A = [
1 0 200 %inf 0
1 1.e-300 200 %inf 0
9.99999999999990010e-001 9.99999999999999980e-201 200 3.15e300 102
9.99999999899999990e-001 1.e-100 200 296 117
1 %inf -%inf %nan 0
];

// Write into a file
filename = fullfile(TMPDIR,"foo.csv");
csvWrite(A, filename);
edit(filename)

See also

• csvRead — Read comma-separated value file
• csvTextScan — Converts into a matrix texts representing separated values
• csvDefault — Get or set defaults behavior for csv files.

History