Documentation

gt, >

Determine greater than

Description

example

A > B returns a logical array with elements set to logical 1 (true) where A is greater than B; otherwise, the element is logical 0 (false). The test compares only the real part of numeric arrays. gt returns logical 0 (false) where A or B have NaN or undefined categorical elements.

gt(A,B) is an alternate way to execute A > B, but is rarely used. It enables operator overloading for classes.

Examples

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Determine if vector elements are greater than a given value.

Create a numeric vector.

A = [1 12 18 7 9 11 2 15];

Test the vector for elements that are greater than 10.

A > 10
ans = 1x8 logical array

0   1   1   0   0   1   0   1

The result is a vector with values of logical 1 (true) where the elements of A satisfy the expression.

Use the vector of logical values as an index to view the values in A that are greater than 10.

A(A > 10)
ans = 1×4

12    18    11    15

The result is a subset of the elements in A.

Create a matrix.

A = magic(4)
A = 4×4

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

Replace all values greater than 9 with the value 10.

A(A > 9) = 10
A = 4×4

10     2     3    10
5    10    10     8
9     7     6    10
4    10    10     1

The result is a new matrix whose largest element is 10.

Create an ordinal categorical array.

A = categorical({'large' 'medium' 'small'; 'medium' ...
'small' 'large'},{'small' 'medium' 'large'},'Ordinal',1)
A = 2x3 categorical array
large       medium      small
medium      small       large

The array has three categories: 'small', 'medium', and 'large'.

Find all values greater than the category 'medium'.

A > 'medium'
ans = 2x3 logical array

1   0   0
0   0   1

A value of logical 1 (true) indicates a value greater than the category 'medium'.

Compare the rows of A.

A(1,:) > A(2,:)
ans = 1x3 logical array

1   1   0

The function returns logical 1 (true) where the first row has a category value greater than the second row.

Create a vector of complex numbers.

A = [1+i 2-2i 1+3i 1-2i 5-i];

Find the values that are greater than 2.

A(A > 2)
ans = 5.0000 - 1.0000i

gt compares only the real part of the elements in A.

Use abs to find which elements are outside a radius of 2 from the origin.

A(abs(A) > 2)
ans = 1×4 complex

2.0000 - 2.0000i   1.0000 + 3.0000i   1.0000 - 2.0000i   5.0000 - 1.0000i

The result has more elements since abs accounts for the imaginary part of the numbers.

Create a vector of dates.

A = datetime([2014,05,01;2014,05,31])
A = 2x1 datetime array
01-May-2014
31-May-2014

Find the dates that occur after May 10, 2014.

A(A > '2014-05-10')
ans = datetime
31-May-2014

Input Arguments

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Operands, specified as scalars, vectors, matrices, or multidimensional arrays. Numeric or string inputs A and B must either be the same size or have sizes that are compatible (for example, A is an M-by-N matrix and B is a scalar or 1-by-N row vector). For more information, see Compatible Array Sizes for Basic Operations.

You can compare numeric inputs of any type, and the comparison does not suffer loss of precision due to type conversion.

If A and B are categorical, datetime, or duration arrays, then they must be the same size unless one is a scalar.

• If one input is an ordinal categorical array, the other input can be an ordinal categorical array, a cell array of character vectors, or a single character vector. A single character vector expands into a cell array of character vectors of the same size as the other input. If both inputs are ordinal categorical arrays, they must have the same sets of categories, including their order. See Compare Categorical Array Elements for more details.

• If one input is a datetime array, the other input can be a datetime array, a character vector, or a cell array of character vectors.

• If one input is a duration array, the other input can be a duration array or a numeric array. The operator treats each numeric value as a number of standard 24-hour days.

• If one input is a string array, the other input can be a string array, a character vector, or a cell array of character vectors. The corresponding elements of A and B are compared lexicographically.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | logical | char | string | categorical | datetime | duration
Complex Number Support: Yes

Compatibility Considerations

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Behavior changed in R2016b