Updated README

README.md

@@ -1,17 +1,17 @@
-# Intro
+# pexpr
 `pexpr` is a module that contains tools to convert from expressions to Abstract Syntax Tree. After that, it can be evaluated(if possible), transformed(prefix, infix, postfix) or even converted to Latex code to generate the expression PDF.
 
 # CLI
 To quickly calculate a math expression just type in command line:
-```
+```python
 python ast.py "(1*2+max(4,5)/3)"
 ```
 and the result will be:
 ```
 3.666666666666667
 ```
 To view the tree, enable the view feature by:
-```
+```python
 python ast.py -v "(1*2+max(4,5)/3)"
 ```
 The result will be the following:
@@ -26,6 +26,13 @@ The result will be the following:
                   /       \
                 (4)       (5)
 ```
+To generate a PDF from the given expression, enable preview feature:
+```python
+python ast.py -p "(1*2+max(4,5)/3)"
+```
+
+<b>Note:</b> To use features related to PDF, please download [miktex](https://miktex.org/download)
+
 <b>Note:</b> quotation is required since there are special characters in some cases
 
 <b>Note:</b> brackets are required since minus sign is a special character
@@ -92,6 +99,8 @@ the output will be displayed on the console:
 ```
 
 # Latex
+<b>Note:</b> To use features related to PDF, please download [miktex](https://miktex.org/download)
+
 `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
@@ -104,7 +113,6 @@ Furthermore, you can generate .tex file by given latex code. The file will only
 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
 genpdf("/location/name.tex", "/target")   # Compiling .tex file from source and save the files to target location
 ```