
Re: Decimal Number and Solving Equation.
MikeArmstrong Feb 15, 2011 11:09 PM (in response to lvl107)
Re: Decimal Number and Solving Equation.
A.Non Feb 16, 2011 5:32 AM (in response to MikeArmstrong)Assuming that all those digits in the starting equation are actually valid, you are better off using the symbolic processor to solve it. It's more accurate.

Re: Decimal Number and Solving Equation.
lvl107 Feb 16, 2011 9:44 AM (in response to MikeArmstrong)Thanks for your help, Mike and Richard. I follow Richard's instruction and :
from (1) & (2) above, what we could say between :
Thanks in advandce,
Regards,
Loi.
Message was edited by: Loi Le

Re: Decimal Number and Solving Equation.
MikeArmstrong Feb 16, 2011 10:21 AM (in response to lvl107)
Re: Decimal Number and Solving Equation.
lvl107 Feb 16, 2011 11:20 AM (in response to MikeArmstrong)After solve, then substitute, x=0 above. We get :
( That means : True , also ) (8)
from (7) & (8) above =>
Thanks again.


Re: Decimal Number and Solving Equation.
A.Non Feb 17, 2011 4:41 AM (in response to lvl107)Of course the two numbers are not strictly equal. You can tell that just by looking at them. You just don't have enough precision in the calculations to see the difference.
By default, the symbolic processor uses 20 digits of precision for floating point calculations. You can change that by using the float keyword (which does not just change the precision of the displayed result; it changes the precision used in the calculations).

Re: Decimal Number and Solving Equation.
lvl107 Feb 18, 2011 6:03 AM (in response to A.Non)I greatly appreciate your answer to my question, Richard. (A nice answer). I think I am new and have not comprehended with "float,50 ,..". Could you tell me more elaborate (as Mike said above) the following :
Regards,
Loi.

(11).PNG 3.0 K

Re: Decimal Number and Solving Equation.
A.Non Feb 18, 2011 8:16 AM (in response to lvl107)That expression is actually a very good example to show what the float keyword does. See the attached.

The float keyword.mcd.zip 12.2 K

Re: Decimal Number and Solving Equation.
lvl107 Feb 18, 2011 10:19 AM (in response to A.Non)
Re: Decimal Number and Solving Equation.
A.Non Feb 18, 2011 10:55 AM (in response to lvl107)Is there a "cheat" way by keystroke to simflify is equivalent to another ?
I'm not sure what you mean. Do you mean "can it be simplified to another equivalent expression?". No. At least, not by either the Maple of the Mupad engines in MC11 and MC15. If you type ,max (note the comma!) after the keyword simplify it will give you the maximum amount of simplification the symbolic processor can do.






