mjhjmtu

I am trying to draw a simple probability tree, where the probabilites could sometimes be fraction or decimals., this means, I will have to adjust the spacing. So I tried the below code. This produces tree but label gone, and error thrown.

documentclassarticle
usepackage[utf8]inputenc

usepackage[linguistics]forest
usepackagephilex


forestset
 my edge label/.style 3 args=
 edge label=node[midway, font=sffamilyscriptsize, #1,xshift=#2]#3,
 ,


titleProblem customizing forest tree
authorparthi292929 
dateNovember 2018



begindocument

maketitle

sectionIntroduction

 scalebox1.2
 beginforest
 for tree=grow'=east
 [0
 [Diseased, my edge label=abovexshift=-2mm0.002
 [Positive
 ]
 [Negative(FN)
 ]
 ]
 [No Disease
 [Positive
 ]
 [Negative
 ] 
 ]
 ]
 ]
 endforest
 


enddocument

Output:

Error:

There are actually 2 issues.

1. 
   style 3 args does not exist, use style n args=3{... instead.


2. You define for the 2nd argument xshift=#2 but add one more xshift when you are saying my edge label=abovexshift=-2mm0.002.

Working code:

documentclassarticle
usepackage[utf8]inputenc

usepackage[linguistics]forest
usepackagephilex


forestset
 my edge label/.style n args=3
 edge label=node[midway, font=sffamilyscriptsize, #1,xshift=#2]#3,
 ,


titleProblem customizing forest tree
authorparthi292929 
dateNovember 2018



begindocument

maketitle

sectionIntroduction

 scalebox1.2
 beginforest
 for tree=grow'=east
 [0
 [Diseased,my edge label=above-2mm0.002
 [Positive
 ]
 [Negative(FN)
 ]
 ]
 [No Disease
 [Positive
 ]
 [Negative
 ] 
 ]
 ]
 ]
 endforest
 


enddocument

Simpler code: pgfkeys already accept comma-separated arguments, which is illustrated in my edge label=above,xshift=-3mm0.002. And instead the xshift you my just use above left or below left etc., as in my edge label=below left0.998.

documentclassarticle
usepackage[utf8]inputenc

usepackage[linguistics]forest
usepackagephilex


forestset
 my edge label/.style n args=2
 edge label=node[midway, font=sffamilyscriptsize,#1]#2,
 ,


titleProblem customizing forest tree
authorparthi292929 
dateNovember 2018



begindocument

maketitle

sectionIntroduction

 scalebox1.2
 beginforest
 for tree=grow'=east
 [0
 [Diseased,my edge label=above,xshift=-3mm0.002
 [Positive
 ]
 [Negative(FN)
 ]
 ]
 [No Disease,my edge label=below left0.998
 [Positive
 ]
 [Negative
 ] 
 ]
 ]
 ]
 endforest
 


enddocument