florent colautti

2.04 x 10^(-5) // = 2.04*0.00001 = 0.0000204

my operation is like this :
2.04 x 10^(-5)             // = 2.04*0.00001 = 0.0000204

exponent-expr

i.e. exponents in expr are written like pow(a,b), as in 'a' to the power of 'b'. Make sure that '.' is after the 10 so that the exponent will be processed as a float.

Don't forget that you have to escape special characters like the comma:

Note that exponentiation is relatively CPU-costly; if either or both parts of the pow() function are constant, it may be worth the effort of using a precalculated value. There are also some special cases (for instance, non-negative integer exponents) where there are simpler functions you might want to use.

Note that exponentiation is relatively CPU-costly; if either or both parts of the pow() function are constant, it may be worth the effort of using a precalculated  value. There are also some special cases (for instance, non-negative integer exponents) where there are simpler functions you might want to use.


no need to backslash escape the comma anymore these days. it is 2013 after all.

In fact I have a big list from ocean sensor, with lot of various number and exponential values...

7.3439156e+005 6.6591366e+000 -8.8263154e-001

7.3439156e+005 6.6961372e+000 -5.6900889e-001

7.3439156e+005 6.6881377e+000 -9.6660798e-001

and Now I can make a new list with "real" value... using expr...

Thanks for your reply and explanation.
In fact  I have a big list from ocean sensor, with lot of various number and exponential values...
7.3439156e+005  6.6591366e+000 -8.8263154e-001
7.3439156e+005  6.6961372e+000 -5.6900889e-001
7.3439156e+005  6.6881377e+000 -9.6660798e-001             

1st I used "regexp" to "unpack" it
and Now I can make a new list with "real" value... using expr...

I used regexp for "unpack" my value : 7.3439156e+005

if function is positive i have a list : 7.34... e +005

but if function is negative (7.3439156e-005) i find : 7.34... e -5 ( zero disappear ???)

next for formatted exponent (+005) i used a another regexp to have 5.

but with the expression I used -5 become also 5

For expr I need 5 (if positive) and -5 (if negative) ( he don't like +5)

If you can help me to solve my problem...

I find a problem on my tree !
I used regexp for "unpack" my value : 7.3439156e+005
if function is positive i have a list  : 7.34... e +005
but if function is negative (7.3439156e-005)  i find : 7.34... e -5  ( zero disappear ???)

next for formatted exponent (+005) i used a another regexp to have 5.
but with the expression I used -5 become also 5

if there occurs something like a*a in your expression, but you also might want negative output, then this expression simsply isnt finished.

a typical situation where one runs into this problem is when using pythagoras to find points in a system.

you will have to split the expression into one "version" for negative and one for positive.

[expr pow($f1\,2.) * ($f1>=0.) + (pow($f1\,2.)*-1) * ($f1

oh i am off track. you are on the regexp layer.

well, try to get the exponents as symbols first or something like that?

I used Jash object "strfilt" & "strcut" to first look if exponent is + or -

I think is not the most efficient, but make what i need...

Yes! I have solve my problem.
I used Jash object "strfilt" & "strcut" to first look if exponent is + or -
then I route it on 2 different way...

I think is not the most efficient, but make what i need... 

no need to backslash escape the comma anymore these days

Old habits die hard. Particularly those you've been using for over two decades. Leaving out the backslash used to cause tserious tsuris.

Hey, what about a more complex exponent like 2^1/19? 

Asking because im trying to design a nice algorithm using expr for calculating the pitches for a microtonal piano patch!

im trying something like this for the ascending pitches...

but when i fill in the variables and bang it just outputs the whatever the input is.

Hey, what about a more complex exponent like 2^1/19? 

Asking because im trying to design a nice algorithm using expr for calculating the pitches for a microtonal piano patch!

im trying something like this for the ascending pitches... 

but when i fill in the variables and bang it just outputs the whatever the input is. 

exponent & expr