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LV 6i: Serious Formula Node problem!
Alfio
Member
10-06-2000 03:53 AM
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I have found a "serious" problem converting VI from LV 5.1.1 to 6i:
I have same "big" equations for density calculation with upper 65 coefficients
and 3 o more inputs variables.
Everything goes well and fast in 5.1.1, when I open this VI in LV 6i there
is automatically conversion
of exponential symbol (from "^" to "**") with non apparent problem,
but the result of equation is WRONG, very, very incorrect (from 0 in 5.1.1
to same negative milliard...).
I tried with more different equations and the results are similar...
For the last: when I re-convert my VI in version 5 and run it in LV 5.1.1
everything re-work PERFECTLY! Strange.
Have I found a "terrible" BUG?
Someone have found the same problem?
Do you have some ide
a?
I will wait some news from you.:-)
Thanks for reading this LONG news.
Bye, bye.
Alfio.
I have same "big" equations for density calculation with upper 65 coefficients
and 3 o more inputs variables.
Everything goes well and fast in 5.1.1, when I open this VI in LV 6i there
is automatically conversion
of exponential symbol (from "^" to "**") with non apparent problem,
but the result of equation is WRONG, very, very incorrect (from 0 in 5.1.1
to same negative milliard...).
I tried with more different equations and the results are similar...
For the last: when I re-convert my VI in version 5 and run it in LV 5.1.1
everything re-work PERFECTLY! Strange.
Have I found a "terrible" BUG?
Someone have found the same problem?
Do you have some ide
a?
I will wait some news from you.:-)
Thanks for reading this LONG news.
Bye, bye.
Alfio.
Ricardo Diniz
Member
10-09-2000 02:40 PM
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"Alfio" wrote:
>>I have found a "serious" problem converting VI from LV 5.1.1 to 6i:>I have
same "big" equations for density calculation with upper 65 coefficients>and
3 o more inputs variables.>Everything goes well and fast in 5.1.1, when I
open this VI in LV 6i there>is automatically conversion>of exponential symbol
(from "^" to "**") with non apparent problem,>but the result of equation
is WRONG, very, very incorrect (from 0 in 5.1.1>to same negative milliard...).>I
tried with more different equations and the results are similar...>For the
last: when I re-convert my VI in version 5 and run it in LV 5.1.1>everything
re-work PERFECTLY! Strange.>Have I found a "terrible" BUG?>Someone have found
the same problem?>Do you have some idea?
>I will wait some news from you.:-)>Thanks
for reading this LONG news. >Bye, bye.>Alfio.
Hi Alfio
Some times ago I had a simmilar problem but with labview 4.x. My equation
in the
formula node was (and still is) very large too but the problem was related
with the
x^2 terms. When these terms were changed with x*x the vi worked fine. Very
strange.....Also, this problem did not appear with small equations. Try a
smaller equation and see what happens. And more: with LV 5.1 (I am using
this version)
there is no problem.
Good luck.
Ricardo.
>>I have found a "serious" problem converting VI from LV 5.1.1 to 6i:>I have
same "big" equations for density calculation with upper 65 coefficients>and
3 o more inputs variables.>Everything goes well and fast in 5.1.1, when I
open this VI in LV 6i there>is automatically conversion>of exponential symbol
(from "^" to "**") with non apparent problem,>but the result of equation
is WRONG, very, very incorrect (from 0 in 5.1.1>to same negative milliard...).>I
tried with more different equations and the results are similar...>For the
last: when I re-convert my VI in version 5 and run it in LV 5.1.1>everything
re-work PERFECTLY! Strange.>Have I found a "terrible" BUG?>Someone have found
the same problem?>Do you have some idea?
>I will wait some news from you.:-)>Thanks
for reading this LONG news. >Bye, bye.>Alfio.
Hi Alfio
Some times ago I had a simmilar problem but with labview 4.x. My equation
in the
formula node was (and still is) very large too but the problem was related
with the
x^2 terms. When these terms were changed with x*x the vi worked fine. Very
strange.....Also, this problem did not appear with small equations. Try a
smaller equation and see what happens. And more: with LV 5.1 (I am using
this version)
there is no problem.
Good luck.
Ricardo.
