eintr: Test print-graph
C.4.1 Testing ‘print-graph’
---------------------------
We can test the ‘print-graph’ function with a short list of numbers:
1. Install the final versions of ‘Y-axis-column’, ‘graph-body-print’,
and ‘print-graph’ (in addition to the rest of the code.)
2. Copy the following expression:
(print-graph '(3 2 5 6 7 5 3 4 6 4 3 2 1))
3. Switch to the ‘*scratch*’ buffer and place the cursor where you
want the axis labels to start.
4. Type ‘M-:’ (‘eval-expression’).
5. Yank the test expression into the minibuffer with ‘C-y’ (‘yank)’.
6. Press <RET> to evaluate the expression.
Emacs will print a graph that looks like this:
10 -
*
** *
5 - **** *
**** ***
* *********
************
1 - *************
| | | |
1 5 10 15
On the other hand, if you pass ‘print-graph’ a ‘vertical-step’ value
of 2, by evaluating this expression:
(print-graph '(3 2 5 6 7 5 3 4 6 4 3 2 1) 2)
The graph looks like this:
20 -
*
** *
10 - **** *
**** ***
* *********
************
2 - *************
| | | |
1 5 10 15
(A question: is the ‘2’ on the bottom of the vertical axis a bug or a
feature? If you think it is a bug, and should be a ‘1’ instead, (or
even a ‘0’), you can modify the sources.)
Info Catalog
eintr: The final version
eintr: Print Whole Graph
eintr: Graphing words in defuns