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<span id="Validating-the-type-of-Arguments"></span><div class="header">
<p>
Next: <a href="Parsing-Arguments.html" accesskey="n" rel="next">Parsing Arguments</a>, Previous: <a href="Validating-the-number-of-Arguments.html" accesskey="p" rel="prev">Validating the number of Arguments</a>, Up: <a href="Validating-Arguments.html" accesskey="u" rel="up">Validating Arguments</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<span id="Validating-the-type-of-Arguments-1"></span><h4 class="subsection">11.9.2 Validating the type of Arguments</h4>
<p>Besides the number of arguments, inputs can be checked for various
properties. <code>validatestring</code> is used for string arguments and
<code>validateattributes</code> for numeric arguments.
</p>
<span id="XREFvalidatestring"></span><dl>
<dt id="index-validatestring">: <em><var>validstr</var> =</em> <strong>validatestring</strong> <em>(<var>str</var>, <var>strarray</var>)</em></dt>
<dt id="index-validatestring-1">: <em><var>validstr</var> =</em> <strong>validatestring</strong> <em>(<var>str</var>, <var>strarray</var>, <var>funcname</var>)</em></dt>
<dt id="index-validatestring-2">: <em><var>validstr</var> =</em> <strong>validatestring</strong> <em>(<var>str</var>, <var>strarray</var>, <var>funcname</var>, <var>varname</var>)</em></dt>
<dt id="index-validatestring-3">: <em><var>validstr</var> =</em> <strong>validatestring</strong> <em>(…, <var>position</var>)</em></dt>
<dd><p>Verify that <var>str</var> is an element, or substring of an element, in
<var>strarray</var>.
</p>
<p>When <var>str</var> is a character string to be tested, and <var>strarray</var> is a
cellstr of valid values, then <var>validstr</var> will be the validated form
of <var>str</var> where validation is defined as <var>str</var> being a member
or substring of <var>validstr</var>. This is useful for both verifying
and expanding short options, such as <code>"r"</code>, to their longer forms,
such as <code>"red"</code>. If <var>str</var> is a substring of <var>validstr</var>, and
there are multiple matches, the shortest match will be returned if all
matches are substrings of each other. Otherwise, an error will be raised
because the expansion of <var>str</var> is ambiguous. All comparisons are case
insensitive.
</p>
<p>The additional inputs <var>funcname</var>, <var>varname</var>, and <var>position</var>
are optional and will make any generated validation error message more
specific.
</p>
<p>Examples:
</p>
<div class="example">
<pre class="example">validatestring ("r", {"red", "green", "blue"})
⇒ "red"
validatestring ("b", {"red", "green", "blue", "black"})
⇒ error: validatestring: multiple unique matches were found for 'b':
blue, black
</pre></div>
<p><strong>See also:</strong> <a href="Comparing-Strings.html#XREFstrcmp">strcmp</a>, <a href="Comparing-Strings.html#XREFstrcmpi">strcmpi</a>, <a href="#XREFvalidateattributes">validateattributes</a>, <a href="Parsing-Arguments.html#XREFinputParser">inputParser</a>.
</p></dd></dl>
<span id="XREFvalidateattributes"></span><dl>
<dt id="index-validateattributes">: <em></em> <strong>validateattributes</strong> <em>(<var>A</var>, <var>classes</var>, <var>attributes</var>)</em></dt>
<dt id="index-validateattributes-1">: <em></em> <strong>validateattributes</strong> <em>(<var>A</var>, <var>classes</var>, <var>attributes</var>, <var>arg_idx</var>)</em></dt>
<dt id="index-validateattributes-2">: <em></em> <strong>validateattributes</strong> <em>(<var>A</var>, <var>classes</var>, <var>attributes</var>, <var>func_name</var>)</em></dt>
<dt id="index-validateattributes-3">: <em></em> <strong>validateattributes</strong> <em>(<var>A</var>, <var>classes</var>, <var>attributes</var>, <var>func_name</var>, <var>arg_name</var>)</em></dt>
<dt id="index-validateattributes-4">: <em></em> <strong>validateattributes</strong> <em>(<var>A</var>, <var>classes</var>, <var>attributes</var>, <var>func_name</var>, <var>arg_name</var>, <var>arg_idx</var>)</em></dt>
<dd><p>Check validity of input argument.
</p>
<p>Confirms that the argument <var>A</var> is valid by belonging to one of
<var>classes</var>, and holding all of the <var>attributes</var>. If it does not,
an error is thrown, with a message formatted accordingly. The error
message can be made further complete by the function name <var>fun_name</var>,
the argument name <var>arg_name</var>, and its position in the input
<var>arg_idx</var>.
</p>
<p><var>classes</var> must be a cell array of strings (an empty cell array is
allowed) with the name of classes (remember that a class name is case
sensitive). In addition to the class name, the following categories
names are also valid:
</p>
<dl compact="compact">
<dt><code>"float"</code></dt>
<dd><p>Floating point value comprising classes <code>"double"</code> and
<code>"single"</code>.
</p>
</dd>
<dt><code>"integer"</code></dt>
<dd><p>Integer value comprising classes (u)int8, (u)int16, (u)int32, (u)int64.
</p>
</dd>
<dt><code>"numeric"</code></dt>
<dd><p>Numeric value comprising either a floating point or integer value.
</p>
</dd>
</dl>
<p><var>attributes</var> must be a cell array with names of checks for <var>A</var>.
Some of them require an additional value to be supplied right after the
name (see details for each below).
</p>
<dl compact="compact">
<dt><code>"<="</code></dt>
<dd><p>All values are less than or equal to the following value in
<var>attributes</var>.
</p>
</dd>
<dt><code>"<"</code></dt>
<dd><p>All values are less than the following value in <var>attributes</var>.
</p>
</dd>
<dt><code>">="</code></dt>
<dd><p>All values are greater than or equal to the following value in
<var>attributes</var>.
</p>
</dd>
<dt><code>">"</code></dt>
<dd><p>All values are greater than the following value in <var>attributes</var>.
</p>
</dd>
<dt><code>"2d"</code></dt>
<dd><p>A 2-dimensional matrix. Note that vectors and empty matrices have
2 dimensions, one of them being of length 1, or both length 0.
</p>
</dd>
<dt><code>"3d"</code></dt>
<dd><p>Has no more than 3 dimensions. A 2-dimensional matrix is a 3-D matrix
whose 3rd dimension is of length 1.
</p>
</dd>
<dt><code>"binary"</code></dt>
<dd><p>All values are either 1 or 0.
</p>
</dd>
<dt><code>"column"</code></dt>
<dd><p>Values are arranged in a single column.
</p>
</dd>
<dt><code>"decreasing"</code></dt>
<dd><p>No value is <var>NaN</var>, and each is less than the preceding one.
</p>
</dd>
<dt><code>"diag"</code></dt>
<dd><p>Value is a diagonal matrix.
</p>
</dd>
<dt><code>"even"</code></dt>
<dd><p>All values are even numbers.
</p>
</dd>
<dt><code>"finite"</code></dt>
<dd><p>All values are finite.
</p>
</dd>
<dt><code>"increasing"</code></dt>
<dd><p>No value is <var>NaN</var>, and each is greater than the preceding one.
</p>
</dd>
<dt><code>"integer"</code></dt>
<dd><p>All values are integer. This is different than using <code>isinteger</code>
which only checks its an integer type. This checks that each value in
<var>A</var> is an integer value, i.e., it has no decimal part.
</p>
</dd>
<dt><code>"ncols"</code></dt>
<dd><p>Has exactly as many columns as the next value in <var>attributes</var>.
</p>
</dd>
<dt><code>"ndims"</code></dt>
<dd><p>Has exactly as many dimensions as the next value in <var>attributes</var>.
</p>
</dd>
<dt><code>"nondecreasing"</code></dt>
<dd><p>No value is <var>NaN</var>, and each is greater than or equal to the preceding
one.
</p>
</dd>
<dt><code>"nonempty"</code></dt>
<dd><p>It is not empty.
</p>
</dd>
<dt><code>"nonincreasing"</code></dt>
<dd><p>No value is <var>NaN</var>, and each is less than or equal to the preceding one.
</p>
</dd>
<dt><code>"nonnan"</code></dt>
<dd><p>No value is a <code>NaN</code>.
</p>
</dd>
<dt><code>"nonnegative"</code></dt>
<dd><p>All values are non negative.
</p>
</dd>
<dt><code>"nonsparse"</code></dt>
<dd><p>It is not a sparse matrix.
</p>
</dd>
<dt><code>"nonzero"</code></dt>
<dd><p>No value is zero.
</p>
</dd>
<dt><code>"nrows"</code></dt>
<dd><p>Has exactly as many rows as the next value in <var>attributes</var>.
</p>
</dd>
<dt><code>"numel"</code></dt>
<dd><p>Has exactly as many elements as the next value in <var>attributes</var>.
</p>
</dd>
<dt><code>"odd"</code></dt>
<dd><p>All values are odd numbers.
</p>
</dd>
<dt><code>"positive"</code></dt>
<dd><p>All values are positive.
</p>
</dd>
<dt><code>"real"</code></dt>
<dd><p>It is a non-complex matrix.
</p>
</dd>
<dt><code>"row"</code></dt>
<dd><p>Values are arranged in a single row.
</p>
</dd>
<dt><code>"scalar"</code></dt>
<dd><p>It is a scalar.
</p>
</dd>
<dt><code>"size"</code></dt>
<dd><p>Its size has length equal to the values of the next in <var>attributes</var>.
The next value must is an array with the length for each dimension. To
ignore the check for a certain dimension, the value of <code>NaN</code> can be
used.
</p>
</dd>
<dt><code>"square"</code></dt>
<dd><p>Is a square matrix.
</p>
</dd>
<dt><code>"vector"</code></dt>
<dd><p>Values are arranged in a single vector (column or vector).
</p>
</dd>
</dl>
<p><strong>See also:</strong> <a href="Built_002din-Data-Types.html#XREFisa">isa</a>, <a href="#XREFvalidatestring">validatestring</a>, <a href="Parsing-Arguments.html#XREFinputParser">inputParser</a>.
</p></dd></dl>
<p>As alternatives to <code>validateattributes</code> there are several shorter
convenience functions to check for individual properties.
</p>
<span id="XREFmustBeFinite"></span><dl>
<dt id="index-mustBeFinite">: <em></em> <strong>mustBeFinite</strong> <em>(<var>x</var>)</em></dt>
<dd>
<p>Require that input <var>x</var> is finite.
</p>
<p>Raise an error if any element of the input <var>x</var> is not finite, as
determined by <code>isfinite (x)</code>.
</p>
<p><strong>See also:</strong> <a href="#XREFmustBeNonNan">mustBeNonNan</a>, <a href="Finding-Elements-and-Checking-Conditions.html#XREFisfinite">isfinite</a>.
</p></dd></dl>
<span id="XREFmustBeGreaterThan"></span><dl>
<dt id="index-mustBeGreaterThan">: <em></em> <strong>mustBeGreaterThan</strong> <em>(<var>x</var>, <var>c</var>)</em></dt>
<dd>
<p>Require that input <var>x</var> is greater than <var>c</var>.
</p>
<p>Raise an error if any element of the input <var>x</var> is not greater than
<var>c</var>, as determined by <code><var>x</var> > <var>c</var></code>.
</p>
<p><strong>See also:</strong> <a href="#XREFmustBeGreaterThanOrEqual">mustBeGreaterThanOrEqual</a>, <a href="#XREFmustBeLessThan">mustBeLessThan</a>, <a href="Comparison-Ops.html#XREFgt">gt</a>.
</p></dd></dl>
<span id="XREFmustBeGreaterThanOrEqual"></span><dl>
<dt id="index-mustBeGreaterThanOrEqual">: <em></em> <strong>mustBeGreaterThanOrEqual</strong> <em>(<var>x</var>, <var>c</var>)</em></dt>
<dd>
<p>Require that input <var>x</var> is greater than or equal to <var>c</var>.
</p>
<p>Raise an error if any element of the input <var>x</var> is not greater than
or equal to <var>c</var>, as determined by <code><var>x</var> >= <var>c</var></code>.
</p>
<p><strong>See also:</strong> <a href="#XREFmustBeGreaterThan">mustBeGreaterThan</a>, <a href="#XREFmustBeLessThanOrEqual">mustBeLessThanOrEqual</a>, <a href="Comparison-Ops.html#XREFge">ge</a>.
</p></dd></dl>
<span id="XREFmustBeInteger"></span><dl>
<dt id="index-mustBeInteger">: <em></em> <strong>mustBeInteger</strong> <em>(<var>x</var>)</em></dt>
<dd>
<p>Require that input <var>x</var> is integer-valued (but not necessarily
integer-typed).
</p>
<p>Raise an error if any element of the input <var>x</var> is not a finite,
real, integer-valued numeric value, as determined by various checks.
</p>
<p><strong>See also:</strong> <a href="#XREFmustBeNumeric">mustBeNumeric</a>.
</p></dd></dl>
<span id="XREFmustBeLessThan"></span><dl>
<dt id="index-mustBeLessThan">: <em></em> <strong>mustBeLessThan</strong> <em>(<var>x</var>, <var>c</var>)</em></dt>
<dd>
<p>Require that input <var>x</var> is less than <var>c</var>.
</p>
<p>Raise an error if any element of the input <var>x</var> is not less than
<var>c</var>, as determined by <code><var>x</var> < <var>c</var></code>.
</p>
<p><strong>See also:</strong> <a href="#XREFmustBeLessThanOrEqual">mustBeLessThanOrEqual</a>, <a href="#XREFmustBeGreaterThan">mustBeGreaterThan</a>, <a href="Comparison-Ops.html#XREFlt">lt</a>.
</p></dd></dl>
<span id="XREFmustBeLessThanOrEqual"></span><dl>
<dt id="index-mustBeLessThanOrEqual">: <em></em> <strong>mustBeLessThanOrEqual</strong> <em>(<var>x</var>, <var>c</var>)</em></dt>
<dd>
<p>Require that input is less than or equal to a given value.
</p>
<p>Raise an error if any element of the input <var>x</var> is not less than
or equal to <var>c</var>, as determined by <code><var>x</var> <= <var>c</var></code>.
</p>
<p><strong>See also:</strong> <a href="#XREFmustBeLessThan">mustBeLessThan</a>, <a href="#XREFmustBeGreaterThanOrEqual">mustBeGreaterThanOrEqual</a>, <a href="Comparison-Ops.html#XREFle">le</a>.
</p></dd></dl>
<span id="XREFmustBeMember"></span><dl>
<dt id="index-mustBeMember">: <em></em> <strong>mustBeMember</strong> <em>(<var>x</var>, <var>valid</var>)</em></dt>
<dd>
<p>Require that input <var>x</var> is a member of a set of given valid values.
</p>
<p>Raise an error if any element of the input <var>x</var> is not a member
of the set <var>valid</var>, as determined by <code>ismember (<var>x</var>)</code>.
</p>
<p>Programming Note: char inputs may behave strangely because of the
interaction between chars and cellstrings when calling <code>ismember</code> on
them. But it will probably "do what you mean" if you just use it naturally.
To guarantee operation, convert all char arrays to cellstrings with
<code>cellstr</code>.
</p>
<p><strong>See also:</strong> <a href="#XREFmustBeNonempty">mustBeNonempty</a>, <a href="Set-Operations.html#XREFismember">ismember</a>.
</p></dd></dl>
<span id="XREFmustBeNegative"></span><dl>
<dt id="index-mustBeNegative">: <em></em> <strong>mustBeNegative</strong> <em>(<var>x</var>)</em></dt>
<dd>
<p>Require that input <var>x</var> is negative.
</p>
<p>Raise an error if any element of the input <var>x</var> is not negative, as
determined by <code><var>x</var> < 0</code>.
</p>
<p><strong>See also:</strong> <a href="#XREFmustBeNonnegative">mustBeNonnegative</a>.
</p></dd></dl>
<span id="XREFmustBeNonempty"></span><dl>
<dt id="index-mustBeNonempty">: <em></em> <strong>mustBeNonempty</strong> <em>(<var>x</var>)</em></dt>
<dd>
<p>Require that input <var>x</var> is nonempty.
</p>
<p>Raise an error if the input <var>x</var> is empty, as determined by
<code>isempty (<var>x</var>)</code>.
</p>
<p><strong>See also:</strong> <a href="#XREFmustBeMember">mustBeMember</a>, <a href="#XREFmustBeNonzero">mustBeNonzero</a>, <a href="Object-Sizes.html#XREFisempty">isempty</a>.
</p></dd></dl>
<span id="XREFmustBeNonNan"></span><dl>
<dt id="index-mustBeNonNan">: <em></em> <strong>mustBeNonNan</strong> <em>(<var>x</var>)</em></dt>
<dd>
<p>Require that input <var>x</var> is non-<code>NaN</code>.
</p>
<p>Raise an error if any element of the input <var>x</var> is <code>NaN</code>, as
determined by <code>isnan (<var>x</var>)</code>.
</p>
<p><strong>See also:</strong> <a href="#XREFmustBeFinite">mustBeFinite</a>, <a href="#XREFmustBeNonempty">mustBeNonempty</a>, <a href="Finding-Elements-and-Checking-Conditions.html#XREFisnan">isnan</a>.
</p></dd></dl>
<span id="XREFmustBeNonnegative"></span><dl>
<dt id="index-mustBeNonnegative">: <em></em> <strong>mustBeNonnegative</strong> <em>(<var>x</var>)</em></dt>
<dd>
<p>Require that input <var>x</var> is not negative.
</p>
<p>Raise an error if any element of the input <var>x</var> is negative, as
determined by <code><var>x</var> >= 0</code>.
</p>
<p><strong>See also:</strong> <a href="#XREFmustBeNonzero">mustBeNonzero</a>, <a href="#XREFmustBePositive">mustBePositive</a>.
</p></dd></dl>
<span id="XREFmustBeNonpositive"></span><dl>
<dt id="index-mustBeNonpositive">: <em></em> <strong>mustBeNonpositive</strong> <em>(<var>x</var>)</em></dt>
<dd>
<p>Require that input <var>x</var> is not positive.
</p>
<p>Raise an error if any element of the input <var>x</var> is positive, as
determined by <code><var>x</var> <= 0</code>.
</p>
<p><strong>See also:</strong> <a href="#XREFmustBeNegative">mustBeNegative</a>, <a href="#XREFmustBeNonzero">mustBeNonzero</a>.
</p></dd></dl>
<span id="XREFmustBeNonsparse"></span><dl>
<dt id="index-mustBeNonsparse">: <em></em> <strong>mustBeNonsparse</strong> <em>(<var>x</var>)</em></dt>
<dd>
<p>Require that input <var>x</var> is not sparse.
</p>
<p>Raise an error if the input <var>x</var> is sparse, as determined by
<code>issparse (<var>x</var>)</code>.
</p>
<p><strong>See also:</strong> <a href="Information.html#XREFissparse">issparse</a>.
</p></dd></dl>
<span id="XREFmustBeNonzero"></span><dl>
<dt id="index-mustBeNonzero">: <em></em> <strong>mustBeNonzero</strong> <em>(<var>x</var>)</em></dt>
<dd>
<p>Require that input <var>x</var> is not zero.
</p>
<p>Raise an error if any element of the input <var>x</var> is zero, as determined
by <code><var>x</var> == 0</code>.
</p>
<p><strong>See also:</strong> <a href="#XREFmustBeNonnegative">mustBeNonnegative</a>, <a href="#XREFmustBePositive">mustBePositive</a>.
</p></dd></dl>
<span id="XREFmustBeNumeric"></span><dl>
<dt id="index-mustBeNumeric">: <em></em> <strong>mustBeNumeric</strong> <em>(<var>x</var>)</em></dt>
<dd>
<p>Require that input <var>x</var> is numeric.
</p>
<p>Raise an error if the input <var>x</var> is not numeric, as determined by
<code>isnumeric (<var>x</var>)</code>.
</p>
<p><strong>See also:</strong> <a href="#XREFmustBeNumericOrLogical">mustBeNumericOrLogical</a>, <a href="Predicates-for-Numeric-Objects.html#XREFisnumeric">isnumeric</a>.
</p></dd></dl>
<span id="XREFmustBeNumericOrLogical"></span><dl>
<dt id="index-mustBeNumericOrLogical">: <em></em> <strong>mustBeNumericOrLogical</strong> <em>(<var>x</var>)</em></dt>
<dd>
<p>Require that input <var>x</var> is numeric or logical.
</p>
<p>Raise an error if the input <var>x</var> is not numeric or logical, as
determined by <code>isnumeric (<var>x</var>) || islogical (<var>x</var>)</code>.
</p>
<p><strong>See also:</strong> <a href="#XREFmustBeNumeric">mustBeNumeric</a>, <a href="Predicates-for-Numeric-Objects.html#XREFisnumeric">isnumeric</a>, <a href="Predicates-for-Numeric-Objects.html#XREFislogical">islogical</a>.
</p></dd></dl>
<span id="XREFmustBePositive"></span><dl>
<dt id="index-mustBePositive">: <em></em> <strong>mustBePositive</strong> <em>(<var>x</var>)</em></dt>
<dd>
<p>Require that input <var>x</var> is positive.
</p>
<p>Raise an error if any element of the input <var>x</var> is not positive, as
determined by <code><var>x</var> > 0</code>.
</p>
<p><strong>See also:</strong> <a href="#XREFmustBeNonnegative">mustBeNonnegative</a>, <a href="#XREFmustBeNonzero">mustBeNonzero</a>.
</p></dd></dl>
<span id="XREFmustBeReal"></span><dl>
<dt id="index-mustBeReal">: <em></em> <strong>mustBeReal</strong> <em>(<var>x</var>)</em></dt>
<dd>
<p>Require that input <var>x</var> is real.
</p>
<p>Raise an error if the input <var>x</var> is not real, as determined by
<code>isreal (<var>x</var>)</code>.
</p>
<p><strong>See also:</strong> <a href="#XREFmustBeFinite">mustBeFinite</a>, <a href="#XREFmustBeNonNan">mustBeNonNan</a>, <a href="Predicates-for-Numeric-Objects.html#XREFisreal">isreal</a>.
</p></dd></dl>
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