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<title>Dr. Dobb's | AI Expert Newsletter - May 2005 | May 6, 2005</title>
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    <DIV class="Bspace4">
    <em>May 06, 2005</em><BR>
    
        <h5>AI Expert Newsletter - May 2005</h5>
        <h2></h2>
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            <DIV class="Bspace15"><em>Dennis Merritt</em></div>
          
      
        <!-- teaser -->
        <DIV class="Bspace15"><span class="greenBlurb">We've devoted this month's issue to spreadsheets and AI, including my Model Master, a program which uses Prolog to reduce spreadsheet errors; neural nets and cellular automata in Excel; notes on Mike Kassof about his work on logical spreadsheets; and Amzi!'s ARulesXL, which by embedding logical rules in Excel, makes possible apps that are not practical using Excel on its own.</span></div>
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			}
		} else if ((endMenuSet && minutes >= endMinutes) || (durationMenuSet && minutes + durationMinutes > 1440)) {
			startMenu&#91;i&#93;.style.fontStyle = "normal";
			startMenu&#91;i&#93;.style.color="red";
		} else {
			startMenu&#91;i&#93;.style.fontStyle = "normal";
			startMenu&#91;i&#93;.style.color="black";
		}
	}
	for (var i = 0; i < endMenu.length; i++) {
		minutes = eval(endMenu&#91;i&#93;.value);
<P>
		if (durationMenuSet && startMenuSet) {
			if(startMinutes + durationMinutes == minutes) {
				endMenu&#91;i&#93;.style.fontStyle = "italic";
				endMenu&#91;i&#93;.style.color="black";
<P>
			} else {
				endMenu&#91;i&#93;.style.fontStyle = "normal";
				endMenu&#91;i&#93;.style.color="red";
			}
		} else if ((startMenuSet && minutes <= startMinutes) || (durationMenuSet && minutes < 360 + durationMinutes)) {
			endMenu&#91;i&#93;.style.fontStyle = "normal";
			endMenu&#91;i&#93;.style.color="red";
		} else {
			endMenu&#91;i&#93;.style.fontStyle = "normal";
			endMenu&#91;i&#93;.style.color="black";
		}
	}
	for (var i = 0; i < durationMenu.length; i++) {
		minutes = eval(durationMenu&#91;i&#93;.value);
<P>

		if (startMenuSet && endMenuSet) {
			if(minutes == endMinutes - startMinutes) {
				durationMenu&#91;i&#93;.style.fontStyle = "italic";
				durationMenu&#91;i&#93;.style.color="black";
<P>
			} else {
				durationMenu&#91;i&#93;.style.fontStyle = "normal";
				durationMenu&#91;i&#93;.style.color="red";
			}
		} else if ((startMenuSet && minutes + startMinutes > 1440) || (endMenuSet && endMinutes < 360 + minutes)) {
<P>
			durationMenu&#91;i&#93;.style.fontStyle = "normal";
			durationMenu&#91;i&#93;.style.color="red";
		} else {
			durationMenu&#91;i&#93;.style.fontStyle = "normal";
			durationMenu&#91;i&#93;.style.color="black";
		}
	}
}
<P>
function durationMenuChanged() {
	var startMenu = document.getElementById("startMenu");
	var startIndex = startMenu.selectedIndex;
	var startMinutes = eval(startMenu&#91;startIndex&#93;.value);
	
	var endMenu = document.getElementById("endMenu");
	var endIndex = endMenu.selectedIndex;
	var endMinutes = eval(endMenu&#91;endIndex&#93;.value);
<P>
	var durationMenu = document.getElementById("durationMenu");
	var durationIndex = durationMenu.selectedIndex;
	var durationMinutes = eval(durationMenu&#91;durationIndex&#93;.value);
<P>

	durationMenu.style.fontStyle = "normal";
<P>
	if(durationIndex > 0) {
		durationMenuSet = true;
	} else {
		durationMenuSet = false;
	}
<P>
	if(durationMenuSet && startMinutes + durationMinutes > 1440) {
		startMenu.selectedIndex = 0;
		startMenuSet = false;
		if (!endMenuSet && endIndex > 0) {
			endMenu.selectedIndex = 0;
			endMenuSet = false;
		}
		startMenu.style.color = "black";
		endMenu.style.color = "black";
		durationMenu.style.color = "black";
	}
<P>
	if(durationMenuSet && endMenuSet && endMinutes - durationMinutes < 360) {
		endMenu.selectedIndex = 0;
		endMenuSet = false;
		if (!startMenuSet && startIndex > 0) {
			startMenu.selectedIndex = 0;
			startMenuSet = false;
		}
		startMenu.style.color = "black";
		endMenu.style.color = "black";
		durationMenu.style.color = "black";
	}
<P>

	if (startMenuSet && !endMenuSet) {
		if (durationMenuSet && durationIndex > 0) {
			endMenu.selectedIndex = (startMinutes + durationMinutes) / 60 - 6;
			endMenu.style.fontStyle = "italic";
		} else {
			endMenu.selectedIndex = 0;
			endMenu.style.fontStyle = "normal";
		}
	}
<P>
	if (endMenuSet && !startMenuSet) {
		if (durationMenuSet && durationIndex > 0) {
			startMenu.selectedIndex = (endMinutes - durationMinutes) / 60 - 5;
			startMenu.style.fontStyle = "italic";
		} else {
			startMenu.selectedIndex = 0;
			startMenu.style.fontStyle = "normal";
		}
	}
<P>
	if (durationMenuSet && durationMinutes == 1080) {
		if (!startMenuSet) {
			startMenu.selectedIndex = 1;
			startMenu.style.fontStyle = "italic";
		}
		if (!endMenuSet) {
			endMenu.selectedIndex = endMenu.length - 1;
			endMenu.style.fontStyle = "italic";
		}
<P>
	}
<P>
	if (!endMenuSet && !startMenuSet && (!durationMenuSet || durationMinutes != 1080)) {
		endMenu.selectedIndex = 0;
		startMenu.selectedIndex = 0;
	}
<P>

	if (startMenuSet && endMenuSet) {
		if(durationMenuSet && startMinutes + durationMinutes != endMinutes) {
			startMenu.style.color = "red";
			endMenu.style.color = "red";
			durationMenu.style.color = "red";
		} else {
			startMenu.style.color = "black";
			endMenu.style.color = "black";
			durationMenu.style.color = "black";
		}
	}
<P>
	for (var i = 0; i < startMenu.length; i++) {
<P>
		minutes = eval(startMenu&#91;i&#93;.value);
<P>

		if (durationMenuSet && endMenuSet) {
			if(minutes + durationMinutes == endMinutes) {
				startMenu&#91;i&#93;.style.fontStyle = "italic";
				startMenu&#91;i&#93;.style.color="black";
<P>
			} else {
				startMenu&#91;i&#93;.style.fontStyle = "normal";
				startMenu&#91;i&#93;.style.color="red";
			}
		} else if ((endMenuSet && minutes >= endMinutes) || (durationMenuSet && minutes + durationMinutes > 1440)) {
			startMenu&#91;i&#93;.style.fontStyle = "normal";
			startMenu&#91;i&#93;.style.color="red";
		} else {
			startMenu&#91;i&#93;.style.fontStyle = "normal";
			startMenu&#91;i&#93;.style.color="black";
		}
	}
	for (var i = 0; i < endMenu.length; i++) {
		minutes = eval(endMenu&#91;i&#93;.value);
<P>
		if (durationMenuSet && startMenuSet) {
			if(startMinutes + durationMinutes == minutes) {
				endMenu&#91;i&#93;.style.fontStyle = "italic";
				endMenu&#91;i&#93;.style.color="black";
<P>
			} else {
				endMenu&#91;i&#93;.style.fontStyle = "normal";
				endMenu&#91;i&#93;.style.color="red";
			}
		} else if ((startMenuSet && minutes <= startMinutes) || (durationMenuSet && minutes < 360 + durationMinutes)) {
			endMenu&#91;i&#93;.style.fontStyle = "normal";
			endMenu&#91;i&#93;.style.color="red";
		} else {
			endMenu&#91;i&#93;.style.fontStyle = "normal";
			endMenu&#91;i&#93;.style.color="black";
		}
	}
	for (var i = 0; i < durationMenu.length; i++) {
		minutes = eval(durationMenu&#91;i&#93;.value);
<P>

		if (startMenuSet && endMenuSet) {
			if(minutes == endMinutes - startMinutes) {
				durationMenu&#91;i&#93;.style.fontStyle = "italic";
				durationMenu&#91;i&#93;.style.color="black";
<P>
			} else {
				durationMenu&#91;i&#93;.style.fontStyle = "normal";
				durationMenu&#91;i&#93;.style.color="red";
			}
		} else if ((startMenuSet && minutes + startMinutes > 1440) || (endMenuSet && endMinutes < 360 + minutes)) {
<P>
			durationMenu&#91;i&#93;.style.fontStyle = "normal";
			durationMenu&#91;i&#93;.style.color="red";
		} else {
			durationMenu&#91;i&#93;.style.fontStyle = "normal";
			durationMenu&#91;i&#93;.style.color="black";
		}
	}
}
<P>

</script>
</head>
<body style="background: #F5F5DC; color: #000000">
<br />
<form action="CHANGE?" method="post" name="form1">
<fieldset>
<legend style="font-family:Arial; color:#993333; background: none"><b>Logical Spreadsheet Demo</b></legend>
<table cellspacing="3">
<tbody>
<tr><th align="left" valign="top" style="color:#660099">Start</th><td valign="top">  </td><td>
<select id="startMenu" onchange="startMenuChanged()">
<option></option>
<option value="360">6:00 am</option>
<option value="420">7:00 am</option>
<option value="480">8:00 am</option>
<option value="540">9:00 am</option>
<option value="600">10:00 am</option>
<option value="660">11:00 am</option>
<option value="720">12:00 pm</option>
<option value="780">1:00 pm</option>
<option value="840">2:00 pm</option>
<option value="900">3:00 pm</option>
<option value="960">4:00 pm</option>
<option value="1020">5:00 pm</option>
<option value="1080">6:00 pm</option>
<option value="1140">7:00 pm</option>
<option value="1200">8:00 pm</option>
<option value="1260">9:00 pm</option>
<option value="1320">10:00 pm</option>
<option value="1380">11:00 pm</option>
</select>
</td><td></td></tr>
<tr><th align="left" valign="top" style="color:#660099">End</th><td valign="top">  </td><td>
<select id="endMenu" onchange="endMenuChanged()">
<option></option>
<option value="420">7:00 am</option>
<option value="480">8:00 am</option>
<option value="540">9:00 am</option>
<option value="600">10:00 am</option>
<option value="660">11:00 am</option>
<option value="720">12:00 pm</option>
<option value="780">1:00 pm</option>
<option value="840">2:00 pm</option>
<option value="900">3:00 pm</option>
<option value="960">4:00 pm</option>
<option value="1020">5:00 pm</option>
<option value="1080">6:00 pm</option>
<option value="1140">7:00 pm</option>
<option value="1200">8:00 pm</option>
<option value="1260">9:00 pm</option>
<option value="1320">10:00 pm</option>
<option value="1380">11:00 pm</option>
<option value="1440">12:00 am</option>
</select>
</td><td></td></tr>
<tr><th align="left" valign="top" style="color:#660099">Duration</th><td valign="top">  </td><td>
<select id="durationMenu" onchange="durationMenuChanged()">
<option></option>
<option value="60">1 hour</option>
<option value="120">2 hours</option>
<option value="180">3 hours</option>
<option value="240">4 hours</option>
<option value="300">5 hours</option>
<option value="360">6 hours</option>
<option value="420">7 hours</option>
<option value="480">8 hours</option>
<option value="540">9 hours</option>
<option value="600">10 hours</option>
<option value="660">11 hours</option>
<option value="720">12 hours</option>
<option value="780">13 hours</option>
<option value="840">14 hours</option>
<option value="900">15 hours</option>
<option value="960">16 hours</option>
<option value="1020">17 hours</option>
<option value="1080">18 hours</option>
</select>
</td><td></td></tr>
</tbody></table>
</fieldset>
</form>
This demo requires a modern browser with JavaScript turned on.  For the full experience, it requires  the Mozilla Firefox browser.  Internet Explorer 6 works well also.
<P>
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