If else statement in grasshopper

Grasshopper
,
1

Is there a way to create if else statement like this one?
if 0<x=<0.2 is true, y =1
if 0.2<x=<0.4 is true, y =2
if 0.4<x=<0.4 is true, y =3
if 0.6<x=<0.8 is true, y =4
if 0.8<x=<1.0 is true, y =5

2

Canvas at 13;55;53
Canvas at 13;55;531331×614 67.5 KB

If else statement_re.gh (10.5 KB)

3 Likes
3

Another possible way:

find domain
find domain1091×688 66.7 KB

find domain.gh (14.9 KB)

3 Likes
4

Thank you,
I just decided to use python instead.

5

:roll_eyes: Be sure to share your Python solution? Hard to believe it would be simpler than what @akilli posted.

6

here is the script
if x <= 0.2 and x >= 0:
print (“1”)
if x <= .4 and x > .2:
print (“2”)
if x <= .6 and x > .4:
print (“3”)
if x <= .8 and x > .6:
print (“4”)
if x <= 1 and x > .8:
print (“5”),
then convert it to a number.

7 
if x <= 0.2 and x >= 0:
    print (“1”)
if x <= .4 and x > .2:
    print (“2”)
if x <= .6 and x > .4:
    print (“3”)
if x <= .8 and x > .6:
    print (“4”)
if x <= 1 and x > .8:
    print (“5”)

That produces an error:

Runtime error (SyntaxErrorException): unexpected token ‘“’

File “”, line 2
print (“1”)
^
SyntaxError: unexpected token ‘“’

This works better:

if x <= 0.2 and x >= 0:
    a = 1
if x <= .4 and x > .2:
    a = 2
if x <= .6 and x > .4:
    a = 3
if x <= .8 and x > .6:
    a = 4
if x <= 1 and x > .8:
    a = 5

Do you understand what @akilli posted? It’s better than a series of “if” statements.

8

Math

if you don t care about includiung 0 and values below 0 or above 1
you can also use
y = Ceiling(x/0.2)

(Ceiling → round up to next integer equal or bigger
Floor → round down …)

Screenshot 2023-02-19 at 23.04.41
Screenshot 2023-02-19 at 23.04.412418×424 99.6 KB

title / topic

and as the title of your topic might direct someone with a complete different question:

The Sift+Combine pattern is designed to mimic conditional clauses (i.e. ‘if statements’). It allows you to pull apart a stream of data, operate on subsets of that stream and then put it all back together again in the same order.

from the old forum

image
image581×572 126 KB

2 Likes
9

Find Domain is far more flexible than a series of hand coded “if” statements:

find domain_2023Feb19a
find domain_2023Feb19a762×508 19.9 KB

find domain_2023Feb19a.gh (12.9 KB)

3 Likes
10

True, I will use that for the future.
Thank you for the help and script it is very much apricated.

11

Stream filter (or stream gate) worked well for me for a true/false if/then filter.