mzxmlinfo

Return information about mzXML file

Syntax

InfoStruct = mzxmlinfo(File)
InfoStruct = mzxmlinfo(File, 'NumOfLevels', NumOfLevelsValue)

Input Arguments

File

Character vector or string containing a file name, or a path and file name, of an mzXML file that conforms to the mzXML 2.1 specification or earlier specifications.

If you specify only a file name, that file must be on the MATLAB® search path or in the current folder.

NumOfLevelsValue

Controls the return of NumOfLevels, an additional field in InfoStruct, that contains the number of mass spectrometry (MS) levels of spectra in File. Choices are true or false (default).

Output Arguments

InfoStruct

MATLAB structure containing information from an mzXML file. It includes the fields shown in the table below.

Description

InfoStruct = mzxmlinfo(File) returns a MATLAB structure, InfoStruct, containing summary information about an mzXML file, File.

File is a character vector or string containing a file name, or a path and file name, of an mzXML file. The file must conform to the mzXML 2.1 specification or earlier specifications. For more information on the mzXML format, see http://tools.proteomecenter.org/wiki/index.php?title=Formats:mzXML.

InfoStruct includes the following fields.

FieldDescription
Filename

Name of the mzXML file.

FileModDate

Modification date of the file.

FileSize

Size of the file in bytes.

NumberOfScans

Number of scans in the file.*

StartTime

Run start time.*

EndTime

Run end time.*

DataProcessingIntensityCutoff

Minimum mass/charge (m/z) intensity value.*

DataProcessingCentroided

Indicates if data is centroided.*

DataProcessingDeisotoped

Indicates if data is deisotoped.*

DataProcessing ChargeDeconvoluted

Indicates if data is deconvoluted.*

DataProcessingSpotIntegration

For LC/MALDI experiments, indicates if peaks eluting over multiple spots have been integrated into a single spot.*

* — These fields contain N/A if the mzXML file does not include the associated attributes. The associated attributes are optional in the mzXML file, per the mzXML 2.1 specification.

InfoStruct = mzxmlinfo(File, 'NumOfLevels', NumOfLevelsValue) controls the return of NumOfLevels, an additional field in mzXMLInfo, that contains the number of mass spectrometry levels of spectra in File. Choices are true or false (default).

Examples

Note

In the following example, the file results.mzxml is not provided. Sample mzXML files can be found at:

Return a MATLAB structure containing summary information about an mzXML file.

info = mzxmlinfo('results.mzxml');

info = 

                            Filename: 'results.mzxml'
                         FileModDate: '07-May-2008 13:39:12'
                            FileSize: 10607
                       NumberOfScans: 2
                           StartTime: 'PT0.00683333S'
                             EndTime: 'PT200.036S'
       DataProcessingIntensityCutoff: 'N/A'
            DataProcessingCentroided: 'false'
            DataProcessingDeisotoped: 'N/A'
    DataProcessingChargeDeconvoluted: 'N/A'
       DataProcessingSpotIntegration: 'N/A'

Return a MATLAB structure containing summary information, including the number of mass spectrometry levels, about an mzXML file.

info = mzxmlinfo('results.mzxml','numoflevels',true);

info = 

                            Filename: 'results.mzxml'
                         FileModDate: '07-May-2008 13:39:12'
                            FileSize: 10607
                       NumberOfScans: 2
                           StartTime: 'PT0.00683333S'
                             EndTime: 'PT200.036S'
       DataProcessingIntensityCutoff: 'N/A'
            DataProcessingCentroided: 'false'
            DataProcessingDeisotoped: 'N/A'
    DataProcessingChargeDeconvoluted: 'N/A'
       DataProcessingSpotIntegration: 'N/A'
                    NumberOfMSLevels: 2

Version History

Introduced in R2008b

See Also