fieldnames

Field names of structure, or public fields of Java or Microsoft COM object

Syntax

fields = fieldnames(S)

fields = fieldnames(obj,'-full')

Description

fields = fieldnames(S) returns the field names of the structure array S in a cell array.

fields = fieldnames(obj,'-full') returns a cell array of character vectors containing the name, type, attributes, and inheritance of the properties of obj. The input argument obj is a Java^® or Microsoft^® COM object.

Examples

Return Field Names and Values

Create a structure array.

S(1,1).x = linspace(0,2*pi);
S(1,1).y = sin(S(1,1).x);
S(1,1).title = 'y = sin(x)';
S(2,1).x = linspace(0,2*pi);
S(2,1).y = cos(S(2,1).x);
S(2,1).title = 'y = cos(x)'

S=2×1 struct array with fields:
    x
    y
    title

Return the field names in a cell array using the fieldnames function.

fields = fieldnames(S)

fields = 3×1 cell
    {'x'    }
    {'y'    }
    {'title'}

To return the values of the fields, use the struct2cell function. struct2cell and fieldnames return the values and the field names in the same order.

values = struct2cell(S)

values=3×2 cell array
    {[                                                      0 0.0635 0.1269 0.1904 0.2539 0.3173 0.3808 0.4443 0.5077 0.5712 0.6347 0.6981 0.7616 0.8251 0.8885 0.9520 1.0155 1.0789 1.1424 1.2059 1.2693 1.3328 1.3963 1.4597 1.5232 1.5867 1.6501 1.7136 1.7771 1.8405 1.9040 1.9675 2.0309 2.0944 2.1579 2.2213 2.2848 2.3483 2.4117 2.4752 2.5387 2.6021 2.6656 2.7291 2.7925 2.8560 2.9195 2.9829 3.0464 3.1099 3.1733 3.2368 3.3003 3.3637 3.4272 3.4907 3.5541 3.6176 3.6811 3.7445 3.8080 3.8715 3.9349 3.9984 4.0619 4.1253 4.1888 4.2523 4.3157 4.3792 4.4427 4.5061 4.5696 4.6331 4.6965 4.7600 4.8235 4.8869 4.9504 5.0139 5.0773 5.1408 5.2043 5.2677 5.3312 5.3947 5.4581 5.5216 5.5851 5.6485 5.7120 5.7755 5.8389 5.9024 5.9659 6.0293 6.0928 6.1563 6.2197 6.2832]}    {[                                             0 0.0635 0.1269 0.1904 0.2539 0.3173 0.3808 0.4443 0.5077 0.5712 0.6347 0.6981 0.7616 0.8251 0.8885 0.9520 1.0155 1.0789 1.1424 1.2059 1.2693 1.3328 1.3963 1.4597 1.5232 1.5867 1.6501 1.7136 1.7771 1.8405 1.9040 1.9675 2.0309 2.0944 2.1579 2.2213 2.2848 2.3483 2.4117 2.4752 2.5387 2.6021 2.6656 2.7291 2.7925 2.8560 2.9195 2.9829 3.0464 3.1099 3.1733 3.2368 3.3003 3.3637 3.4272 3.4907 3.5541 3.6176 3.6811 3.7445 3.8080 3.8715 3.9349 3.9984 4.0619 4.1253 4.1888 4.2523 4.3157 4.3792 4.4427 4.5061 4.5696 4.6331 4.6965 4.7600 4.8235 4.8869 4.9504 5.0139 5.0773 5.1408 5.2043 5.2677 5.3312 5.3947 5.4581 5.5216 5.5851 5.6485 5.7120 5.7755 5.8389 5.9024 5.9659 6.0293 6.0928 6.1563 6.2197 6.2832]}
    {[0 0.0634 0.1266 0.1893 0.2511 0.3120 0.3717 0.4298 0.4862 0.5406 0.5929 0.6428 0.6901 0.7346 0.7761 0.8146 0.8497 0.8815 0.9096 0.9341 0.9549 0.9718 0.9848 0.9938 0.9989 0.9999 0.9969 0.9898 0.9788 0.9638 0.9450 0.9224 0.8960 0.8660 0.8326 0.7958 0.7557 0.7127 0.6668 0.6182 0.5671 0.5137 0.4582 0.4009 0.3420 0.2817 0.2203 0.1580 0.0951 0.0317 -0.0317 -0.0951 -0.1580 -0.2203 -0.2817 -0.3420 -0.4009 -0.4582 -0.5137 -0.5671 -0.6182 -0.6668 -0.7127 -0.7557 -0.7958 -0.8326 -0.8660 -0.8960 -0.9224 -0.9450 -0.9638 -0.9788 -0.9898 -0.9969 -0.9999 -0.9989 -0.9938 -0.9848 -0.9718 -0.9549 -0.9341 -0.9096 -0.8815 -0.8497 -0.8146 -0.7761 -0.7346 -0.6901 -0.6428 -0.5929 -0.5406 -0.4862 -0.4298 -0.3717 -0.3120 -0.2511 -0.1893 -0.1266 -0.0634 -2.4493e-16]}    {[1 0.9980 0.9920 0.9819 0.9679 0.9501 0.9284 0.9029 0.8738 0.8413 0.8053 0.7660 0.7237 0.6785 0.6306 0.5801 0.5272 0.4723 0.4154 0.3569 0.2969 0.2358 0.1736 0.1108 0.0476 -0.0159 -0.0792 -0.1423 -0.2048 -0.2665 -0.3271 -0.3863 -0.4441 -0.5000 -0.5539 -0.6056 -0.6549 -0.7015 -0.7453 -0.7861 -0.8237 -0.8580 -0.8888 -0.9161 -0.9397 -0.9595 -0.9754 -0.9874 -0.9955 -0.9995 -0.9995 -0.9955 -0.9874 -0.9754 -0.9595 -0.9397 -0.9161 -0.8888 -0.8580 -0.8237 -0.7861 -0.7453 -0.7015 -0.6549 -0.6056 -0.5539 -0.5000 -0.4441 -0.3863 -0.3271 -0.2665 -0.2048 -0.1423 -0.0792 -0.0159 0.0476 0.1108 0.1736 0.2358 0.2969 0.3569 0.4154 0.4723 0.5272 0.5801 0.6306 0.6785 0.7237 0.7660 0.8053 0.8413 0.8738 0.9029 0.9284 0.9501 0.9679 0.9819 0.9920 0.9980 1]}
    {'y = sin(x)'                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  }    {'y = cos(x)'                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         }

Input Arguments

S — Input structure array

structure array

Input structure array.

obj — Input object

Java object | Microsoft COM object

Input object, specified as a Java object or Microsoft COM object.

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using MATLAB® Coder™.

Usage notes and limitations:

• The input must be a structure. Objects are not supported.

Thread-Based Environment

Run code in the background using MATLAB® backgroundPool or accelerate code with Parallel Computing Toolbox™ ThreadPool.

This function fully supports thread-based environments. For more information, see Run MATLAB Functions in Thread-Based Environment.

Distributed Arrays

Partition large arrays across the combined memory of your cluster using Parallel Computing Toolbox™.

This function fully supports distributed arrays. For more information, see Run MATLAB Functions with Distributed Arrays (Parallel Computing Toolbox).

Version History

Introduced before R2006a