Mathematica 9 is now available
Student Support Forum
-----
Student Support Forum: 'DSolve problem on section 1.5.8 of MathematicaB...' topicStudent Support Forum > General > Archives > "DSolve problem on section 1.5.8 of MathematicaB..."

Next Comment >Help | Reply To Topic
Author Comment/Response
Carmen Garcia
02/18/02 12:26pm

If I enter the following equation as given in the example:

DSolve[y'[x] == a y[x] + 1, y[x], x]

I get the following error:

DSolve::deqn :
Equation or list of equations expected instead
of True in the first argument True.

Out[177]= DSolve[True,y[x],x]

I must note that the above equation is 'DSolved' correctly in the example help notepad.

However, if I add a second asterisk to increase the derivative to degree two as follows:

DSolve[y''[x] == a y[x] + 1, y[x], x]

then I get a proper solution.
If I modify the equation on the example help notepad, for instance by changing to degree-two as I did above, and then reverting back to degree-one, the equation gives the same error there, too.

What's the problem here?



URL: ,

Subject (listing for 'DSolve problem on section 1.5.8 of MathematicaB...')
Author Date Posted
DSolve problem on section 1.5.8 of MathematicaB... Carmen Garcia 02/18/02 12:26pm
Re: DSolve problem on section 1.5.8 of Mathemat... Forum Modera... 02/18/02 6:11pm
Next Comment >Help | Reply To Topic