http://www.mapleprimes.com/questions/126250-Error-Invalid-Input en-us 2026 Maplesoft, A Division of Waterloo Maple Inc. Maplesoft Document System Sat, 13 Jun 2026 20:01:23 GMT Sat, 13 Jun 2026 20:01:23 GMT The latest answers and comments added to the Question, Error, invalid input http://www.mapleprimes.com/images/mapleprimeswhite.jpg http://www.mapleprimes.com/questions/126250-Error-Invalid-Input http://www.mapleprimes.com/questions/126250-Error-Invalid-Input?ref=Feed:MaplePrimes:Error, invalid input:Comments#answer126252 <pre>wrong:<br>xcir(t):=0.3 + 0.15*sin(t):<br>better:<br>xcir:=t-&gt;0.3 + 0.15*sin(t):</pre> <pre>wrong:<br>xcir(t):=0.3 + 0.15*sin(t):<br>better:<br>xcir:=t-&gt;0.3 + 0.15*sin(t):</pre> 126252 Tue, 04 Oct 2011 22:45:40 Z ThU ThU http://www.mapleprimes.com/questions/126250-Error-Invalid-Input?ref=Feed:MaplePrimes:Error, invalid input:Comments#answer126257 <p>Probably a more serious error: in the definition of qd2 you're using qd3 as a function, i.e. you have qd3(t), but the definition of qd3 makes it an expression, not a function.<br><br>See e.g. <a href="http://www.math.ubc.ca/~israel/advisor/advisor6/a3r1.htm">http://www.math.ubc.ca/~israel/advisor/advisor6/a3r1.htm</a></p> <p>Probably a more serious error: in the definition of qd2 you're using qd3 as a function, i.e. you have qd3(t), but the definition of qd3 makes it an expression, not a function.<br><br>See e.g. <a href="http://www.math.ubc.ca/~israel/advisor/advisor6/a3r1.htm">http://www.math.ubc.ca/~israel/advisor/advisor6/a3r1.htm</a></p> 126257 Wed, 05 Oct 2011 06:06:08 Z Robert Israel Robert Israel