csvWrite

Parameters

filename

a 1-by-1 matrix of strings, the file path.

M

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

separator

a 1-by-1 matrix of strings, the column separator mark.

decimal

a 1-by-1 matrix of strings, the decimal mark. The available values are "." or ",".

precision

a 1-by-1 matrix of strings, the C format.

comments

a m-by-1 matrix of strings, the comments stored at the beginning of the file. This option may be used, for example, to put a licence header in a data file.

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 comments
            comments = [
            "// Copyright (C) INRIA"
            "//  This file must be used under the terms of the CeCILL."
            ];
            csvWrite(M, filename,[],[],[],comments);
            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

History