same equation, different result

same equation, different result - Messages

#1 Posted: 11/19/2012 5:45:57 AM
Jens Præst

Jens Præst

0 likes in 3 posts.

Group: User

I was making a calculation of E.pot = m*h*g, m= 65kg h=3,5m g=9,82m/s^2
if I write 'h*m*g=' I get 2234,05J, but if I write
'E.pot:=m*g*h E.pot=' I get 2405,9J


edit: smath file attached
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#2 Posted: 11/19/2012 6:38:35 AM
Radovan Omorjan

Radovan Omorjan

325 likes in 2052 posts.

Group: Moderator

Hello,

I think you've made some mistake here.
Please attach the problematic SMath file to the post.

Regards,
Radovan
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!"
#3 Posted: 11/20/2012 11:14:50 AM
Davide Carpi

Davide Carpi

1415 likes in 2872 posts.

Group: Moderator

Wrote

I was making a calculation of E.pot = m*h*g, m= 65kg h=3,5m g=9,82m/s^2
if I write 'h*m*g=' I get 2234,05J, but if I write
'E.pot:=m*g*h E.pot=' I get 2405,9J

edit: smath file attached



Hi jenspraest,

It's not a bug, just a behavior...


Please hold the mouse on the [MATH lang=eng]E.pot[/MATH] definition... you can see that SMath assign all available variables, so when you make a call to [MATH lang=eng]E.pot[/MATH] only the [MATH]h[/MATH] value will be replaced; to have the "right" behavior you need to place the definition before the variable assignments or to create a function [MATH lang=eng]E.pot(m,h)[/MATH]

regards,

w3b5urf3r
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#4 Posted: 11/24/2012 9:10:06 AM
jabadu

jabadu

1 likes in 37 posts.

Group: User

This is already a known behavior - see this post:

overridung variables depends on position of variable assignment

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