Invalid Parenthensis in Formula

M

MM2forever

Active Member
Licensed User
Longtime User
Hi guys,
can you tell me what gives the invalid parenthensis with this formula?:

(234.67*0.434292289*Ln(6.1*exp((7.45*temp.Value)/(234.67+temp.Value)*
2.3025851)*lf.Value/100/6.1))/(7.45-0.434292289*Ln(6.1*exp((7.45*
temp.Value)/(234.67+temp.Value)*2.3025851)*lf.Value/100/6.1))
Click to expand...

is it the Ln function which recieves a value higher than a Double or just some wrong brackets?
 
D

dzt

Active Member
Licensed User

:sign0085::sign0148:

Why don't you try to brake it in smaller parts?
 

specci48

Well-Known Member
Licensed User
Longtime User
Hi MM2forever,

there is no function exp() provided by basic4ppc. Is this a custon function implemented by you?


specci48
 
M

MM2forever

Active Member
Licensed User
Longtime User
uppsss...

I thought replaced all exp's, but i forgot some as you see.
(it used to be an excel formula)

Thanks for the lead!

I've corrected it to this:

(234.67*0.434292289*Ln(6.1*cE^(7.45*temp.Value)/(234.67+temp.Value)*
2.3025851)* lf.Value/100/6.1))/(7.45-0.434292289*Ln(6.1*(cE^(7.45*
temp.Value)/(234.67+temp.Value)*2.3025851)*lf.Value/100/6.1))

but it still gives me the same error
 
M

MM2forever

Active Member
Licensed User
Longtime User
hi, i finally made it:

I've eased and split up the formula to this:

SDD=6.1078*10^((a*temp.Value)/(b+temp.Value))
DD=lf.Value/100*SDD
v=Log(DD/6.1078)
TD=b*v/(a-v)

(TD is the result)

now it works!

BTW: this formula calculates the 'dew point' from the given temperature and rel. humidity
 
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