How to add another variable in function Reduce

Graph Academy & Newbie Questions Newbie Questions
1

hello, I have created a little traveling line for the bus like following

image
image1227×478 25.3 KB

I want to get the shortest time path between "start" and "fin" with the function reduce, I hope to calculate the sum of running time(temps), and when it changes the bus, we add the time of Changement(att),temps and att are parameters in relationships.

the following is the code I want to realize

match (a:station {name:"start"}),(b:station{name:"fin"}),
p=((a)-[*]->(b))
with p,
reduce(s=0,r in relationships(p) #and ln=type(relationship(p))# (I know it's incorrect| case type(r) when ln then s+r.temps else s+r.temps+r.att and ln=type(r) end)AS temps
return p, temps order by temps asc limit 1

Is it possible to add another variable like ln in function reduce to realize it or is there another solution?
Thank you

2

Hello @zhiyizhou1995 and welcome to the Neo4j community :slight_smile:

You can try to to use a list as accumulator: reduce(s=[0, 0]...) and then to add s[0] + 1 or s[1] + 1.

Regards,
Cobra

3

thank you! You mean s[0], s[1] here represent different variables? it can also be a string?

4

Take a list l = [0, 0], l[0] will be the first element and l[1] will be the second element so you can add integer to the first or the second element, you can also use a list of strings I guess if you want to merge strings like l = ['', ''].

5

@Cobra Thanks a lot!