Matlab is a programming platform used to analyse data, create algorithms and also create models. Tables in Matlab are used to make storing and reading of data more efficient and understandable. They consist of rows and column-oriented variables.
All the variables in the table can be of different sizes and data types, ensuring that all the variables have an equal number of rows.
The table is a data type used for tabular data. It is one of the most effective and efficient ways to summarise any given information in columns, which also helps find specific information easily.
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Tables in MATLAB
Tables store the column-oriented data in a variable. Often table, table array, and matrix are confused in Matlab. They are similar with just a slight difference in their characteristics.
Table and Array Table
As mentioned above, they consist of rows and column-oriented variables and store column-oriented data like columns from any text file or spreadsheet directly. The table variables can be of different data types and sizes, though a specific column must contain all the same data type variables. The only constraint in this is that the number of rows needs to be the same throughout. Table and Table array are the same thing.
Martix and Array
Matlab stands for Matrix Laboratory, and hence it is primarily designed to perform matrix operations. A matrix or array should have the data type of all the variables to be the same even in different columns. This means that the entire matrix or array will be of only one data type. Matrices aren’t as memory efficient as tables.
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How to create a table in MATLAB?
We already know that working with tables improves efficiency and the capability to understand the data. They are vital for better readability of tables and increased efficiency in understanding the data.
The methods for creating tables discussed below use the following functions:
With these simple functions, the most complex array, cell or structure can be converted into a table, with and without the variable names depending on the syntax. Listed below are the different ways of creating a table in Matlab.
Using keyword ‘table’
The keyword ‘table’ creates a table array with named variables that can contain different types. The syntax for the table is explained in the following example.
Here, all the variables with their specific data are initialised. A table named T is then declared and assigned the values of all the variables initialised previously. When this code is run, the output obtained is a 6×4 table.
The output table has a mix of data types standing true to its property.
Using Function array2table
The function array2table is used to convert a homogeneous array to a table. There are two possible conversions using this method.
Without Variable Names
A matrix A has been declared in the syntax below, and a table named T. Table T is assigned to the function array2table to convert matrix A into a table.
The output for this code is observed as a 4×4 table without any specific variable names given. Since the code did not specify any variable names, the table takes the variable names to be A1, A2, A3, and A4.
To assign variable names to this, follow the method below.
With Variable Names
The syntax for printing the table from an array with variable names is very similar to the syntax without variable names. The only key difference is in using the function array2table assigned to Table T.
Here, since the variable names were given, the output does not have the names A1, A2, A3, and A4 like it did previously. Instead, it has the variable names as that of fruits.
Also, note that in this code, one of the numbers is in the float data type (8.7), but this has caused no error since the upper-class data type is still numeric.
Using Function cell2table
The function cell2table is used to convert a cell array to a table. Just like the array2table function, this can also be done in two ways.
Without Variable Names
The following syntax for converting a cell A predefined with values to a table T using the function cell2table.
Similar to the functioning of array2table, the table can get misleading without variable names, hence defying the table’s purpose completely.
To assign variable names, the method below can be followed.
With Variable Names
The following syntax is used to convert cell A into a table T with the variable names for each column.
It can be clearly observed that the table’s readability is maximised.
Using Function struct2table
The function struct2table is used to convert a structure array to a table. There can be two types of structure arrays while converting it to a table. The syntax for the function struct2table for both types of structure arrays is below.
The above code shows the initialisation of the Scalar Structure, ‘S’. T is the table’s declaration, which uses the function struct2table is converting the structure to a tabular form, as shown below.
Due to the initialisation of the variables, while giving the data, the table is not unnamed as A1, A2 and A3 as seen in our previous case of array2table and cell2table.
The following code represents the syntax for the conversion of a non-scalar structure to a table using the struct2table function.
Following is the output table for a non-scalar structure. The output obtained in both cases is the same.
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