Recent changes to 2865: Plot title is not initialized correctly following a plot with no valid data

#2865 Plot title is not initialized correctly following a plot with no valid data

Ethan Merritt — Mon, 30 Mar 2026 23:33:09 -0000

status: open --> pending-fixed

#2865 Plot title is not initialized correctly following a plot with no valid data

Ethan Merritt — Mon, 30 Mar 2026 23:22:20 -0000

Description has changed:

Diff:

--- old
+++ new
@@ -6,5 +6,3 @@
          &#34;title.bug&#34; line 11: warning: Skipping data file with no valid points
          &#34;title.bug&#34; line 11: warning: Skipping data file with no valid points
          &#34;title.bug&#34; line 11: undefined variable: foo
-
-The same problem is present for splot.

#2865 Plot title is not initialized correctly following a plot with no valid data

Ethan Merritt — Mon, 30 Mar 2026 22:25:12 -0000

Description has changed:

Diff:

--- old
+++ new
@@ -2,7 +2,6 @@

 Reproducer:


-    list = &#34;A B&#34;
     plot for [foo in &#34;A B&#34;] &#39;silver.dat&#39; title foo if (0), 40-x/2
          &#34;title.bug&#34; line 11: warning: Skipping data file with no valid points
          &#34;title.bug&#34; line 11: warning: Skipping data file with no valid points

Group: -->
Priority: -->

Plot title is not initialized correctly following a plot with no valid data

Ethan Merritt — Mon, 30 Mar 2026 22:21:53 -0000

If a plot title is given as a string-valued function, this expression is stored for evaluation after the plot is drawn and then cleared. However if the plot is never drawn because there are no valid data points, the stored expression is not cleared. If the following plot component does not specify a title, it inherits the unused expression which is at best wrong and at worst may cause an error failure because the expression is no longer valid.

Reproducer:

list = "A B"
plot for [foo in "A B"] 'silver.dat' title foo if (0), 40-x/2
     "title.bug" line 11: warning: Skipping data file with no valid points
     "title.bug" line 11: warning: Skipping data file with no valid points
     "title.bug" line 11: undefined variable: foo

The same problem is present for splot.

Plot title is not initialized correctly following a plot with no valid data

Ethan Merritt — Mon, 30 Mar 2026 22:21:53 -0000

Ticket 2865 has been modified: Plot title is not initialized correctly following a plot with no valid data
Edited By: Ethan Merritt (sfeam)
Description updated:
--- description-old

+++ description-new

@@ -2,7 +2,6 @@

Reproducer:

list = "A B"
plot for [foo in "A B"] 'silver.dat' title foo if (0), 40-x/2
"title.bug" line 11: warning: Skipping data file with no valid points
"title.bug" line 11: warning: Skipping data file with no valid points

Plot title is not initialized correctly following a plot with no valid data

Ethan Merritt — Mon, 30 Mar 2026 22:21:53 -0000

Ticket 2865 has been modified: Plot title is not initialized correctly following a plot with no valid data
Edited By: Ethan Merritt (sfeam)
Description updated:
--- description-old

+++ description-new

@@ -5,6 +5,4 @@

 plot for [foo in "A B"] 'silver.dat' title foo if (0), 40-x/2
      "title.bug" line 11: warning: Skipping data file with no valid points
      "title.bug" line 11: warning: Skipping data file with no valid points

- "title.bug" line 11: undefined variable: foo

-The same problem is present for splot.
+ "title.bug" line 11: undefined variable: foo

Plot title is not initialized correctly following a plot with no valid data

Ethan Merritt — Mon, 30 Mar 2026 22:21:53 -0000

Ticket 2865 has been modified: Plot title is not initialized correctly following a plot with no valid data
Edited By: Ethan Merritt (sfeam)
Status updated: 'open' => 'pending-fixed'