Updated README

README.md

@@ -52,7 +52,7 @@ the same as `build("a+b")`:
 ```
 However, only the first tree can be evaluated since it contains numbers but not variables:
 ```python
-build("1+2").evaluate() # 3.0
+evaluate(build("1+2")) # 3.0
 ```
 
 A tree with parentheses will override the precedence:
@@ -66,8 +66,8 @@ A tree with parentheses will override the precedence:
 ```
 And the results, of course, are different:
 ```python
-build("3*(1+2)").evaluate()     # 9.0
-build("3*1+2").evaluate()       # 5.0
+evaluate(build("3*(1+2)"))     # 9.0
+evaluate(build("3*1+2"))       # 5.0
 ```
 
 # Tree viewer
@@ -95,23 +95,28 @@ the output will be displayed on the console:
 `lat.py` module allows you to convert from python math expressions to latex codes. For instance:
 ```python
 tree = build("2+pi*sin(x+2)/cos(x^(y+1))")  # Build a ast first
-lat_expr = tolat(expr)                      # Convert to latex code
+lat_expr = genlat(tree)                     # Convert to latex code
 # The output will be:
 # ${2+\frac{{\pi*sin({x+2})}}{cos({x^{y+1}})}}$
 ```
 Furthermore, you can generate .tex file by given latex code. The file will only contains the header, footer and the given expression:
 ```python
-totex(lat_expr, "/location")   # Save the .tex file to given location with name
+gentex(lat_expr, "/location", "name")   # Save .tex file to location with name
 ```
 After that, a pdf file can be generated by compiling the .tex file
 <b>(Please make sure you have pdflatex installed)</b>
 ```python
-topdf("/location", "/target")   # Compiling .tex file from source and save the files to target location
+genpdf("/location/name.tex", "/target")   # Compiling .tex file from source and save the files to target location
 ```
 pdflatex will compile the .tex file and generate files such as log files and so on.
 If you want only the pdf file, enable the rm optional arg:
 ```python
-topdf("/location", "/target", rm=True)  # This will remove all additional files except for pdf
+genpdf("/location/name.tex", "/target", rm=True)  # This will remove all additional files except for pdf
+```
+There's also a quicker way to generate the PDF file, it merges the previous functions into one function:
+```python
+quickgen(tree, "/target", "name")  # This will generate only the .pdf file with name to target location
+quickgen(tree, "/target", "name", op=True)  # This will open the pdf file with system default app
 ```