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Is there a way to highlight and quickly evaluate a simple math expression without using elisp notation? For example, we can already evaluate the elisp expression (+ 1 1) in the following text snippet by putting point behind it and pressing C-x C-e.
Here is a math equation: (+ 1 1)
But can we also do
Here is a math equation: 1 + 1
And get its result?
You can use the built-in calc package to do so.
3 * (1 + 1)calc-grab-region
calc-dispatch (default C-x *), then hit g
C-u C-x * e while the expression is marked, and the marked expression will be replaced by the result. Afterwards, use C-x * x to exit calc.
calc-dispatch g.
Feb 9, 2018 at 15:21
You might also use calc's embedded mode if you intent to replace an expression with its result in the current buffer. C-u C-x * e when your formula / expression is on it's own on a separate line.
Otherwise mark it and type C-0 C-x * e
(Update: thanks to Dodgie, forgot to mention that) When you are finished with your mathematical manipulations type C-x * e again to end embedded calc mode.
