I have a piece of code that works well, but when I put a semicolon after a plotting statement, the semicolon appears in red. What's the error?
It's not a syntax mistake. Consider it a suggestion,
FrontEnd tells you: "maybe you want to plot it as it has no much sense now".
Of course it may have sense, it's just a suggestion.
If you take a closer look you will find that storing such
Plot makes more sense for
A bit of historic background
Before Mathematica version 6 graphics were produced as a side-effect much as
Now you get this behavior:
Note that the output is
- Graphics - and the plot itself is handled like
- Graphics - output it was common to see plot statements terminated with a semicolon, which returns
Null which is not written to the Notebook.
In version 6 syntax highlighting of that trailing semicolon was added to remind people that with it no output at all would be produced, since the
Graphics object is no longer printed as a side-effect.