Note: This page has been translated by MathWorks. Please click here

To view all translated materials including this page, select Japan from the country navigator on the bottom of this page.

To view all translated materials including this page, select Japan from the country navigator on the bottom of this page.

Determine if matrix or table rows are sorted

`TF = issortedrows(A)`

`TF = issortedrows(A,column)`

`TF = issortedrows(___,direction)`

`TF = issortedrows(___,Name,Value)`

`TF = issortedrows(tblA)`

`TF = issortedrows(tblA,'RowNames')`

`TF = issortedrows(tblA,rowDimName)`

`TF = issortedrows(tblA,vars)`

`TF = issortedrows(___,direction)`

`TF = issortedrows(___,Name,Value)`

`TF = issortedrows(`

returns
the logical scalar 1 (`A`

)`true`

) when the elements of
the first column of a matrix `A`

are listed in ascending
order. Otherwise, `issortedrows`

returns 0 (`false`

).
When the first column has consecutive repeated elements, `issortedrows`

determines
whether the next column is in ascending order, and repeats this behavior
for succeeding equal values.

`TF = issortedrows(___,`

returns
1 when the first column of `direction`

)`A`

is in the order specified
by `direction`

for any of the previous syntaxes.
For example, `issortedrows(A,'monotonic')`

checks
if the first column of `A`

is in ascending or descending
order. `direction`

can also be a cell array of character
vectors representing multiple directions for each column being checked.
For example, `issortedrows(A,[2 3],{'ascend' 'descend'})`

checks
if the second column of `A`

is in ascending order,
then checks if the third column is in descending order to break ties.

`TF = issortedrows(___,`

specifies
additional parameters for checking sort order. For example, `Name,Value`

)`issortedrows(A,'ComparisonMethod','abs')`

checks
if the elements in the first column of `A`

are sorted
by magnitude.

`TF = issortedrows(`

checks
if the rows of a table are in ascending order based on the elements
in the first variable. If elements in the first variable are repeated,
then `tblA`

)`issortedrows`

checks the elements in the second
variable, and so on.

If `tblA`

is a timetable, then `issortedrows`

checks
if the rows of `tblA`

are in ascending order based
on its row times. Row times of a timetable label the rows along the
first dimension of the timetable.

`TF = issortedrows(`

checks
if the rows of a table are in ascending order based on its row names.
Row names of a table label the rows along the first dimension of the
table.`tblA`

,'RowNames')

This syntax is not supported when `tblA`

is
a timetable.

`TF = issortedrows(`

checks
if the rows of a table are sorted by row labels `tblA`

,`rowDimName`

)`rowDimName`

along
the first dimension.

If

`tblA`

is a table, then the labels are row names.If

`tblA`

is a timetable, then the labels are row times.

`TF = issortedrows(`

checks
if the rows of a table are in ascending order based on the elements
in variables `tblA`

,`vars`

)`vars`

. For example, if `Age`

and `Weight`

are
variables of `tblA`

, then `issortedrows(tblA,{'Age','Weight'})`

checks
if the rows are in ascending order by age, then by weight to break
ties.

If

`tblA`

is a table with row names, then`vars`

can include the row names.If

`tblA`

is a timetable, then`vars`

can include the row times.

`TF = issortedrows(___,`

checks
if a table is sorted in the order specified by `direction`

)`direction`

for
any of the previous table syntaxes. `direction`

can
be a single sort order such as `'descend'`

or `'monotonic'`

,
which is applied to each specified variable, row name, or row time. `direction`

can
also be a cell array whose elements contain different sort orders
for each specified variable, row name, or row time that `issortedrows`

operates
on.

`TF = issortedrows(___,`

specifies
additional parameters for sorting tables. For example, `Name,Value`

)`issortedrows(tblA,'Var1','MissingPlacement','first')`

checks
that missing elements in `Var1`

, such as `NaN`

or `NaT`

,
are placed at the beginning of the table.

Was this topic helpful?