This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.


Create table of probe set library information


ProbeInfo = probelibraryinfo(CELStruct, CDFStruct)

Input Arguments

CELStruct Structure created by the affyread function from an Affymetrix® CEL file.
CDFStructStructure created by the affyread function from an Affymetrix CDF library file associated with the CEL file.

Output Arguments

ProbeInfoThree-column matrix with the same number of rows as the Probes field of the CELStruct.
  • Column 1 — Probe set ID/name to which the probe belongs. (Probes that do not belong to a probe set in the CDF library file have probe set ID/name equal to 0.)

  • Column 2 — Contains the probe pair number.

  • Column 3 — Indicates if the probe is a perfect match (1) or mismatch (-1) probe.


ProbeInfo = probelibraryinfo(CELStruct, CDFStruct) creates a table of information linking the probe data from CELStruct, a structure created from an Affymetrix CEL file, with probe set information from CDFStruct, a structure created from an Affymetrix CDF file.


Affymetrix probe pair indexing is 0-based, while MATLAB® software indexing is 1-based. The output from probelibraryinfo is 1-based.


collapse all

This example shows how to extract probe set library information from Affymetrix® GeneChip® microarray data.

This example uses sample data from the E. coli Antisense Genome Array. Download the data from Extract the data files from the DTT archive using the Data Transfer Tool.

You also need to download Ecoli_ASv2.CDF library file for the E. coli Antisense Genome Array. You may already have these files if you have any Affymetrix GeneChip software installed on your machine. If not, get the library files by downloading and unzipping the E. coli Antisense Genome Array zip file.

Read the contents of a CEL file into a MATLAB structure.

celStruct = affyread('Ecoli-antisense-121502.CEL');

Read the contents of a CDF file into a MATLAB structure.

cdfStruct = affyread('C:\LibFiles\Ecoli_ASv2.CDF');

Extract probe set library information.

probeInfo = probelibraryinfo(celStruct, cdfStruct);

Determine the probe set to which the 1104th probe belongs.

ans =


Introduced before R2006a

Was this topic helpful?