struct2table

Convert structure array to table

Syntax

T = struct2table(S)

T = struct2table(S,Name,Value)

Description

T = struct2table(S) converts the structure array, S, to a table, T. Each field of S becomes a variable in T.

T = struct2table(S,Name,Value) creates a table from a structure array, S, with additional options specified by one or more Name,Value pair arguments.

For example, you can specify row names to include in the table.

Examples

Convert Scalar Structure to Table

Convert a scalar structure to a table using the default options.

Create a structure array, S.

S.Name = {'CLARK';'BROWN';'MARTIN'};
S.Gender = {'M';'F';'M'};
S.SystolicBP = [124;122;130];
S.DiastolicBP = [93;80;92];

S

S = struct with fields:
           Name: {3x1 cell}
         Gender: {3x1 cell}
     SystolicBP: [3x1 double]
    DiastolicBP: [3x1 double]

The scalar structure, S, has four fields, each with three rows.

Convert the structure array to a table.

T = struct2table(S)

T=3×4 table
       Name       Gender    SystolicBP    DiastolicBP
    __________    ______    __________    ___________

    {'CLARK' }    {'M'}        124            93     
    {'BROWN' }    {'F'}        122            80     
    {'MARTIN'}    {'M'}        130            92     

The structure field names in S become the variable names in the output table. The size of T is 3-by-4.

Change Name from a variable to row names by modifying the table property, T.Properties.RowNames, and then deleting the variable Name.

T.Properties.RowNames = T.Name;
T.Name = [];

T

T=3×3 table
              Gender    SystolicBP    DiastolicBP
              ______    __________    ___________

    CLARK     {'M'}        124            93     
    BROWN     {'F'}        122            80     
    MARTIN    {'M'}        130            92     

Convert Nonscalar Structure Array to Table

Create a nonscalar structure array, S.

S(1,1).Name = 'CLARK';
S(1,1).Gender = 'M';
S(1,1).SystolicBP = 124;
S(1,1).DiastolicBP = 93;

S(2,1).Name = 'BROWN';
S(2,1).Gender = 'F';
S(2,1).SystolicBP = 122;
S(2,1).DiastolicBP = 80;

S(3,1).Name = 'MARTIN';
S(3,1).Gender = 'M';
S(3,1).SystolicBP = 130;
S(3,1).DiastolicBP = 92;

S

S=3×1 struct array with fields:
    Name
    Gender
    SystolicBP
    DiastolicBP

S is a 3-by-1 structure array with four fields.

Convert the structure array to a table.

T = struct2table(S)

T=3×4 table
       Name       Gender    SystolicBP    DiastolicBP
    __________    ______    __________    ___________

    {'CLARK' }    {'M'}        124            93     
    {'BROWN' }    {'F'}        122            80     
    {'MARTIN'}    {'M'}        130            92     

The structure field names in S become the variable names in the output table. The size of T is 3-by-4.

Treat Scalar Structure As Array

Use 'AsArray',true to create a table from a scalar structure whose fields have different numbers of rows.

Create a scalar structure, S, with fields name, billing, and test.

S.name = 'John Doe';
S.billing = 127.00;
S.test = [79, 75, 73; 180, 178, 177.5; 220, 210, 205];
S

S = struct with fields:
       name: 'John Doe'
    billing: 127
       test: [3x3 double]

The fields have different numbers of rows. Therefore, you cannot use struct2table(S), which uses 'AsArray',false by default.

Treat the scalar structure as an array and convert it to a table.

T = struct2table(S,'AsArray',true)

T=1×3 table
        name        billing        test    
    ____________    _______    ____________

    {'John Doe'}      127      {3x3 double}

T contains one row.

Input Arguments

S — Structure array

structure array

Structure array, specified as a scalar structure array.

• If S is a scalar structure with n fields, all of which have m rows, then T is an m-by-n table.

• If S is a nonscalar m-by-1 structure array with n fields, then T is an m-by-n table.

Name-Value Pair Arguments

Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside quotes. You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

Example: 'RowNames',{'row1','row2','row3'} uses the row names, row1, row2, and row3 for the table, T.

'RowNames' — Row names

{} (default) | cell array of character vectors | string array

Row names, specified as the comma-separated pair consisting of 'RowNames' and a cell array of character vectors or a string array, whose elements are nonempty and distinct.

Row names can have any Unicode^® characters, including spaces and non-ASCII characters.

If you specify row names that have leading or trailing whitespace characters, then struct2table removes them from the row names.

'DimensionNames' — Dimension names

two-element cell array of character vectors | two-element string array

Since R2021a

Dimension names, specified as a two-element cell array of character vectors or two-element string array whose elements are nonempty and distinct.

Dimension names can have any Unicode characters, including spaces and non-ASCII characters.

Before R2021a, you can specify dimension names only by setting the DimensionNames property of the output.

'AsArray' — Indicator for how to treat scalar structure

false (default) | true | 0 | 1

Indicator for how to treat scalar structure, specified as the comma-separated pair consisting of 'AsArray' and either false, true, 0, or 1.

true	struct2table converts S to a table with one row and n variables. The variables can be different sizes.
false	struct2table converts a scalar structure array with n fields into an m-by-n table. Each field must have m rows. This is the default behavior

Output Arguments

T — Output table

table

Output table, returned as a table. The table can store metadata such as descriptions, variable units, variable names, and row names. For more information, see the Properties section of table.

Extended Capabilities

C/C++ Code Generation

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

Usage notes and limitations:

• For more information, see Code Generation for Tables (MATLAB Coder) and Table Limitations for Code Generation (MATLAB Coder).