# HG changeset patch
# User Rik <rik@octave.org>
# Date 1685555075 25200
# Node ID 32313c5e1bfc0a0786494707f12ec9460d9c79f3
# Parent  8b795293c050b653de088041ebbc04cae4637287
Don't use 2-digit exponent format for ticklabels when unnecessary.

* graphics.cc (calc_ticklabels): New boolean variable is_2digit_exp.
Cycle through ticklabel values using log10 to determine if maximum
exponent is greater than or equal to 10.  As soon as this condition
is found set is_2digit_exp to true and break out of loop.
Within ticklabel formatting loop, only print leading '0' if is_2digit_exp
is true and the current exponent to be printed is less than 10.

diff -r 8b795293c050 -r 32313c5e1bfc libinterp/corefcn/graphics.cc
--- a/libinterp/corefcn/graphics.cc	Wed May 31 10:12:26 2023 -0700
+++ b/libinterp/corefcn/graphics.cc	Wed May 31 10:44:35 2023 -0700
@@ -7943,14 +7943,16 @@
     {
       double significand;
       double exponent;
-      double exp_max = 0.0;
-      double exp_min = 0.0;
+      bool is_2digit_exp = false;
 
       for (int i = 0; i < values.numel (); i++)
         {
-          double exp = std::log10 (values(i));
-          exp_min = std::min (exp_min, exp);
-          exp_max = std::max (exp_max, exp);
+          double exp = std::abs (std::log10 (values(i)));
+          if (exp >= 10.0)
+            {
+              is_2digit_exp = true;
+              break;
+            }
         }
 
       for (int i = 0; i < values.numel (); i++)
@@ -7969,7 +7971,7 @@
             exponent = std::floor (std::log10 (-values(i)));
           else
             exponent = std::floor (std::log10 (values(i)));
-          significand = values(i) * std::pow (10., -exponent);
+          significand = values(i) * std::pow (10.0, -exponent);
 
           os.precision (5);
           os.str ("");
@@ -7986,7 +7988,7 @@
               os << '-';
               exponent = -exponent;
             }
-          if (exponent < 10. && (exp_max > 9 || exp_min < -9))
+          if (exponent < 10.0 && is_2digit_exp)
             os << '0';
           os << exponent << '}';