diff --git a/lib/node_modules/@stdlib/plot/base/ctor/lib/defaults.js b/lib/node_modules/@stdlib/plot/base/ctor/lib/defaults.js
index 4d0e929a11c3..db52ed2a24f4 100644
--- a/lib/node_modules/@stdlib/plot/base/ctor/lib/defaults.js
+++ b/lib/node_modules/@stdlib/plot/base/ctor/lib/defaults.js
@@ -109,6 +109,9 @@ function defaults() {
 	// Number of x-axis tick marks:
 	o.xNumTicks = 5;
 
+	// x-axis scale:
+	o.xScale = 'linear';
+
 	// x-axis tick format:
 	o.xTickFormat = null;
 
diff --git a/lib/node_modules/@stdlib/plot/base/ctor/lib/main.js b/lib/node_modules/@stdlib/plot/base/ctor/lib/main.js
index d06d83cb323c..c992b16f9461 100644
--- a/lib/node_modules/@stdlib/plot/base/ctor/lib/main.js
+++ b/lib/node_modules/@stdlib/plot/base/ctor/lib/main.js
@@ -61,6 +61,8 @@ var setPaddingRight = require( './props/padding-right/set.js' );
 var getPaddingRight = require( './props/padding-right/get.js' );
 var setPaddingTop = require( './props/padding-top/set.js' );
 var getPaddingTop = require( './props/padding-top/get.js' );
+var setXScale = require( './props/x-scale/set.js' );
+var getXScale = require( './props/x-scale/get.js' );
 var render = require( './render' );
 var stub = require( './render/stub.js' );
 var setRenderFormat = require( './props/render-format/set.js' );
@@ -174,6 +176,7 @@ var merge = mergeFcn({
 * @param {(Date|FiniteNumber|null)} [options.xMax=null] - maximum value of x-axis domain
 * @param {(Date|FiniteNumber|null)} [options.xMin=null] - minimum value of x-axis domain
 * @param {(NonNegativeInteger|null)} [options.xNumTicks=5] - number of x-axis tick marks
+* @param {string} [options.xScale='time'] - x-axis scale
 * @param {(string|null)} [options.xTickFormat=null] - x-axis tick format
 * @param {string} [options.yAxisOrient='left'] - y-axis orientation
 * @param {string} [options.yLabel='y'] - y-axis label
@@ -220,12 +223,17 @@ function Plot() {
 			throw new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
 		}
 	} else if ( nargs === 2 ) {
-		options = {};
+		options = {
+			'x': arguments[ 0 ],
+			'y': arguments[ 1 ]
+		};
 	} else if ( nargs > 2 ) {
-		if ( !isObject( arguments[ 2 ] ) ) {
+		if ( !isObject( arguments[2] ) ) {
 			throw new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', arguments[2] ) );
 		}
-		options = copy( arguments[ 2 ] ); // avoid mutation
+		options = copy( arguments[2] ); // avoid mutation
+		options.x = arguments[ 0 ];
+		options.y = arguments[ 1 ];
 	}
 	opts = merge( opts, options );
 
@@ -1023,6 +1031,33 @@ defineProperty( Plot.prototype, 'xRange', {
 	'get': getXRange
 });
 
+/**
+* Scale function for mapping values to a coordinate along the x-axis. When retrieved, the returned value is a scale function.
+*
+* @name xScale
+* @memberof Plot.prototype
+* @type {string}
+* @throws {TypeError} must be a string
+* @default 'linear'
+*
+* @example
+* var plot = new Plot();
+* plot.xScale = 'time';
+*
+* @example
+* var plot = new Plot({
+*     'xScale': 'time'
+* });
+* var scale = plot.xScale;
+* // returns <Function>
+*/
+defineProperty( Plot.prototype, 'xScale', {
+	'configurable': false,
+	'enumerable': true,
+	'set': setXScale,
+	'get': getXScale
+});
+
 /**
 * x-axis tick format.
 *
diff --git a/lib/node_modules/@stdlib/plot/base/ctor/lib/props/x-scale/get.js b/lib/node_modules/@stdlib/plot/base/ctor/lib/props/x-scale/get.js
new file mode 100644
index 000000000000..7da479347d9a
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/base/ctor/lib/props/x-scale/get.js
@@ -0,0 +1,54 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2018 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var linear = require( 'd3-scale' ).scaleLinear; // TODO: remove
+var time = require( 'd3-scale' ).scaleTime; // TODO: remove
+
+
+// MAIN //
+
+/**
+* Returns a scale function for mapping values to a coordinate along the x-axis.
+*
+* @private
+* @returns {Function} scale function
+*/
+function get() {
+	/* eslint-disable no-invalid-this */
+	var scale;
+	if ( this._xScale === 'time' ) {
+		scale = time()
+			.domain( this.xDomain )
+			.range( this.xRange );
+	} else if ( this._xScale === 'linear' ) {
+		scale = linear()
+			.domain( this.xDomain )
+			.range( this.xRange );
+	}
+	// TODO: other scales
+	return scale;
+}
+
+
+// EXPORTS //
+
+module.exports = get;
diff --git a/lib/node_modules/@stdlib/plot/base/ctor/lib/props/x-scale/set.js b/lib/node_modules/@stdlib/plot/base/ctor/lib/props/x-scale/set.js
new file mode 100644
index 000000000000..6178e1b7d8f7
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/base/ctor/lib/props/x-scale/set.js
@@ -0,0 +1,63 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2018 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var logger = require( 'debug' );
+var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
+var format = require( '@stdlib/string/format' );
+
+
+// VARIABLES //
+
+var debug = logger( 'plot:base:set:x-scale' );
+
+
+// MAIN //
+
+/**
+* Sets the x-axis scale.
+*
+* @private
+* @param {string} scale - axis scale
+* @throws {TypeError} must be a string
+* @returns {void}
+*/
+function set( scale ) {
+	/* eslint-disable no-invalid-this */
+	if ( !isString( scale ) ) {
+		throw new TypeError( format( 'invalid assignment. `%s` must be a string. Value: `%s`.', 'xScale', scale ) );
+	}
+	// TODO: test for valid scale
+
+	if ( scale !== this._xScale ) {
+		debug( 'Current value: %s.', this._xScale );
+
+		this._xScale = scale;
+		debug( 'New value: %s.', this._xScale );
+
+		this.emit( 'change' );
+	}
+}
+
+
+// EXPORTS //
+
+module.exports = set;