Caution: Places where Jmp does something unexpected

hogi — Thu, 25 Dec 2025 21:39:52 GMT

Definitely, . And that's great!!

Besides this difference, there are other places where Jmp doesn't do/behave/produce what a newbie / innocent Jmp user expects.

If a user knows these issues and the remedies and workarounds - he/she can
a) save a lot of time

b) be safe from data loss

c) be sure that the results are as expected.

[More like this]

Topic	description	Links
There are several steps where CTRL-Z (Undo) doesn't work

Data Tables
Formula column + excluded rows	Unlike plots and reports, column formulas don't use the information about excluded rows. Workaround: col mean(:height, excluded())
Source Scripts + Tables/Update	Tables/Update overwrites an existing Source script same issue for Concatenate + Append to first table	workaround, @internal: use our bug-fixed Update platform it archives the source script before overwriting it
	Danger! Besides importing new data from an Excel file, the script resets ALL changes of the data table. (!!!)
issues with dates	JMP prefers M.D.Y this can lead to issues with D.M.Y
issues with decimal separator	file import: no setting for decimal separator neither via GUI nor via JSL
Score unique & count unique	excluded rows are excluded from the calculation. values don't get updated after changing the row states

Platforms
Query Builder + Formula Columns	Formula Columns get transferred to the result table, where they get evaluated again. Issues with dif(), Lag(), Col.. () aggregations ... !
issue with excluded()	Some of the Platforms of the Tables menu produce their output ignoring the excluded() row state, others take the excluded() row state into account.
Tables/Split possible issue with Keep	Split merges multiple rows into a single row. "Keep" - which entry? the first one - can lead to surprising results:
Scoring in Graph Builder	The graph doesn't get updated when row states are changed in the data table

JSL
Jmp doesn't wait till a data table is fully processed when executing subsequent JSL code.	add wait() or dt << run formulas()

Python

Graph Builder
Platforms in JMP accept fractional values as Freq : )	... Graph Builder doesn't
Graph Builder + Heatmaps	there should be an option to disable the automatic adjustment of the axis increment
~~Graph Builder~~ + manually changed axis labels	~~Manual axis labels are mixed up when columns are added, removed or dragged to a different position~~	Bug fixed in JMP19
Type Properties	Type properties collide with Data Filters -> significant harm for exploratory data analysis	https://community.jmp.com/t5/Discussions/consistent-marker-and-style-control-type-properties/m-p/917699/highlight/true#M107731
Several Inconsistencies of Color/Style settings in Graph Builder

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Caution: Places where Jmp does something unexpected