reallog - Natural logarithm for nonnegative real arrays - MATLAB (original) (raw)

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Natural logarithm for nonnegative real arrays

Description

`Y` = reallog([X](#mw%5F77668b57-d762-4bec-9783-596dccf47f6c)) returns the natural logarithm of each element in array X. ArrayX must contain only nonnegative real numbers. The size ofY is the same as the size of X.

If X is a table or timetable, then Y is a table or timetable. (since R2023a)

Examples

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Create a 4-by-4 matrix and compute the natural log of each element.

X = 4×4

16     2     3    13
 5    11    10     8
 9     7     6    12
 4    14    15     1

Y = 4×4

2.7726    0.6931    1.0986    2.5649
1.6094    2.3979    2.3026    2.0794
2.1972    1.9459    1.7918    2.4849
1.3863    2.6391    2.7081         0

Input Arguments

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Input, specified as a scalar, vector, matrix, multidimensional array, table, or timetable. The values in X must be nonnegative and real.

Data Types: single | double | table | timetable

Extended Capabilities

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Thereallog function fully supports tall arrays. For more information, see Tall Arrays.

The reallog function supports GPU array input with these usage notes and limitations:

If the output of the function running on the GPU can be complex, then you must explicitly specify its input arguments as complex. For more information, see Work with Complex Numbers on a GPU (Parallel Computing Toolbox).

For more information, see Run MATLAB Functions on a GPU (Parallel Computing Toolbox).

Version History

Introduced before R2006a

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The reallog function can calculate on all variables within a table or timetable without indexing to access those variables. All variables must have data types that support the calculation. For more information, see Direct Calculations on Tables and Timetables.