# HG changeset patch
# User Steve Losh <steve@stevelosh.com>
# Date 1693236625 14400
# Node ID 4a3841624d4cae7a5af78e029d01222b7630df5b
# Parent  b6a2dcc7df717d553e844b76b7d667f3bc567767
Update

diff -r b6a2dcc7df71 -r 4a3841624d4c README.markdown
--- a/README.markdown	Mon Aug 28 11:07:47 2023 -0400
+++ b/README.markdown	Mon Aug 28 11:30:25 2023 -0400
@@ -103,3 +103,18 @@
 past and forgotten about it.  The full precision is there, it was only rounding
 to display.  I set it to 6 to avoid this, but also the `PREFIX` key will show
 the full precision temporarily.
+
+Figured out (again) how to program the calculator to do logs of arbitrary bases.
+Essentially:
+
+    logₓ(y) = ln(y)/ln(x)
+
+              stack
+    LBL C     x y
+    LN        x ln(y)
+    x<->y     ln(y) x
+    LN        ln(y) ln(x)
+    ÷         ln(y)/ln(x) = logₓ(y)
+    RTN
+
+