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Strange behavior of Out[]
Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30pm US/Eastern)
Announcing the arrival of Valued Associate #679: Cesar Manara
Unicorn Meta Zoo #1: Why another podcast?How do I extract the contents of a selected cell as plain text?How to make a parallel auto-generated .m package from Initialization cells?Making flash cards with MathematicaDifference between double quotesHow is CellContext->CellGroup supposed to work?Automatic shading of all InitializationCell->True cells in older versions“Find currently evaluating cell” does not seem to work correctlyExporting notebooks inserts unwanted $CellContext. Workaround?Stop notebook from auto-scrolling upon printingDocked Cell Slider that controls magnification of Output Cells only
$begingroup$
Let's create two notebooks external.nb and primary.nb. Then call the external.nb notebook from the primary.nb and investigate values of Out[ ]. The context of the external notebook is not important, however for the demonstration of the strange behavior it should contain number of cells. My external.nb notebook contains 4 cells:
a=1;
b=1
c=1
d
The primary notebook contains the single cell which calls the external notebook from the primary. If we put both notebooks in the same directory, the cell is
NotebookEvaluate @ FileNameJoin[
NotebookDirectory[EvaluationNotebook[]], "external.nb"
]
Open the primary.nb and evaluate the cell which calls the evaluation of the external.nb.
The output yields
Out[1] = d
So it returns output of the last cell of the called notebook.
Now refer to input %4 of primary.nb. I would expect an empty output, since at the moment there is no %4 out in the primary notebook. However the result is the same d.
Asking
?? Out[]
we see the primary.nb knows all Out[] values of the external.nb notebook. Bug or feature?
front-end kernel
edited Mar 19 at 11:27
Kuba♦
107k12211536
asked Mar 19 at 11:22
user18792user18792
1,785915
$endgroup$
add a comment |
$begingroup$
Let's create two notebooks external.nb and primary.nb. Then call the external.nb notebook from the primary.nb and investigate values of Out[ ]. The context of the external notebook is not important, however for the demonstration of the strange behavior it should contain number of cells. My external.nb notebook contains 4 cells:
a=1;
b=1
c=1
d
The primary notebook contains the single cell which calls the external notebook from the primary. If we put both notebooks in the same directory, the cell is
NotebookEvaluate @ FileNameJoin[
NotebookDirectory[EvaluationNotebook[]], "external.nb"
]
Open the primary.nb and evaluate the cell which calls the evaluation of the external.nb.
The output yields
Out[1] = d
So it returns output of the last cell of the called notebook.
Now refer to input %4 of primary.nb. I would expect an empty output, since at the moment there is no %4 out in the primary notebook. However the result is the same d.
Asking
?? Out[]
we see the primary.nb knows all Out[] values of the external.nb notebook. Bug or feature?
front-end kernel
edited Mar 19 at 11:27
Kuba♦
107k12211536
asked Mar 19 at 11:22
user18792user18792
1,785915
$endgroup$
$begingroup$
The kernel state (including In/Out values) is not local to notebooks. This is expected.
$endgroup$
– Szabolcs
Mar 19 at 12:05
$begingroup$
That is clear, however why then not to continue the enumeration from the last Out[ ] value the kernel knows in the new notebook? I find this confusing.
$endgroup$
– user18792
Mar 19 at 12:17
$begingroup$
Right, now I see what you mean.primary.nbkeeps counting up from 1, yet higher input line values are already set inOutthanks toexternal.nb. It is indeed strange.
$endgroup$
– Szabolcs
Mar 19 at 12:22
add a comment |
$begingroup$
Let's create two notebooks external.nb and primary.nb. Then call the external.nb notebook from the primary.nb and investigate values of Out[ ]. The context of the external notebook is not important, however for the demonstration of the strange behavior it should contain number of cells. My external.nb notebook contains 4 cells:
a=1;
b=1
c=1
d
The primary notebook contains the single cell which calls the external notebook from the primary. If we put both notebooks in the same directory, the cell is
NotebookEvaluate @ FileNameJoin[
NotebookDirectory[EvaluationNotebook[]], "external.nb"
]
Open the primary.nb and evaluate the cell which calls the evaluation of the external.nb.
The output yields
Out[1] = d
So it returns output of the last cell of the called notebook.
Now refer to input %4 of primary.nb. I would expect an empty output, since at the moment there is no %4 out in the primary notebook. However the result is the same d.
Asking
?? Out[]
we see the primary.nb knows all Out[] values of the external.nb notebook. Bug or feature?
front-end kernel
edited Mar 19 at 11:27
Kuba♦
107k12211536
asked Mar 19 at 11:22
user18792user18792
1,785915
$endgroup$
Let's create two notebooks external.nb and primary.nb. Then call the external.nb notebook from the primary.nb and investigate values of Out[ ]. The context of the external notebook is not important, however for the demonstration of the strange behavior it should contain number of cells. My external.nb notebook contains 4 cells:
a=1;
b=1
c=1
d
The primary notebook contains the single cell which calls the external notebook from the primary. If we put both notebooks in the same directory, the cell is
NotebookEvaluate @ FileNameJoin[
NotebookDirectory[EvaluationNotebook[]], "external.nb"
]
Open the primary.nb and evaluate the cell which calls the evaluation of the external.nb.
The output yields
Out[1] = d
So it returns output of the last cell of the called notebook.
Now refer to input %4 of primary.nb. I would expect an empty output, since at the moment there is no %4 out in the primary notebook. However the result is the same d.
Asking
?? Out[]
we see the primary.nb knows all Out[] values of the external.nb notebook. Bug or feature?
front-end kernel
front-end kernel
edited Mar 19 at 11:27
Kuba♦
107k12211536
asked Mar 19 at 11:22
user18792user18792
1,785915
edited Mar 19 at 11:27
Kuba♦
107k12211536
asked Mar 19 at 11:22
user18792user18792
1,785915
edited Mar 19 at 11:27
Kuba♦
107k12211536
edited Mar 19 at 11:27
Kuba♦
107k12211536
edited Mar 19 at 11:27
Kuba♦
107k12211536
107k12211536
asked Mar 19 at 11:22
user18792user18792
1,785915
asked Mar 19 at 11:22
user18792user18792
1,785915
asked Mar 19 at 11:22
user18792user18792
1,785915
1,785915
$begingroup$
The kernel state (including In/Out values) is not local to notebooks. This is expected.
$endgroup$
– Szabolcs
Mar 19 at 12:05
$begingroup$
That is clear, however why then not to continue the enumeration from the last Out[ ] value the kernel knows in the new notebook? I find this confusing.
$endgroup$
– user18792
Mar 19 at 12:17
$begingroup$
Right, now I see what you mean.primary.nbkeeps counting up from 1, yet higher input line values are already set inOutthanks toexternal.nb. It is indeed strange.
$endgroup$
– Szabolcs
Mar 19 at 12:22
add a comment |
$begingroup$
The kernel state (including In/Out values) is not local to notebooks. This is expected.
$endgroup$
– Szabolcs
Mar 19 at 12:05
$begingroup$
That is clear, however why then not to continue the enumeration from the last Out[ ] value the kernel knows in the new notebook? I find this confusing.
$endgroup$
– user18792
Mar 19 at 12:17
$begingroup$
Right, now I see what you mean.primary.nbkeeps counting up from 1, yet higher input line values are already set inOutthanks toexternal.nb. It is indeed strange.
$endgroup$
– Szabolcs
Mar 19 at 12:22
$begingroup$
The kernel state (including In/Out values) is not local to notebooks. This is expected.
$endgroup$
– Szabolcs
Mar 19 at 12:05
$begingroup$
The kernel state (including In/Out values) is not local to notebooks. This is expected.
$endgroup$
– Szabolcs
Mar 19 at 12:05
$begingroup$
That is clear, however why then not to continue the enumeration from the last Out[ ] value the kernel knows in the new notebook? I find this confusing.
$endgroup$
– user18792
Mar 19 at 12:17
$begingroup$
That is clear, however why then not to continue the enumeration from the last Out[ ] value the kernel knows in the new notebook? I find this confusing.
$endgroup$
– user18792
Mar 19 at 12:17
$begingroup$
Right, now I see what you mean.
primary.nb keeps counting up from 1, yet higher input line values are already set in Out thanks to external.nb. It is indeed strange.$endgroup$
– Szabolcs
Mar 19 at 12:22
$begingroup$
Right, now I see what you mean.
primary.nb keeps counting up from 1, yet higher input line values are already set in Out thanks to external.nb. It is indeed strange.$endgroup$
– Szabolcs
Mar 19 at 12:22
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
I am guessing that this has to do with the following note in the NotebookEvaluate documentation:
The cells of the notebook are evaluated in a dialog subsession.
Here is an example session demonstrating similar behaviour:
See Dialog if you are not familiar with it.
Within the dialog, $Line keeps getting incremented as usual, and Out values are set. But once the dialog finishes, $Line is reset to its original value.
This is documented:
Dialog automatically localizes the values of
$Line,$MessageList, and$Epilog.
Side note: A dialog is something you would normally encounter not when explicitly entering it, but when interrupting evaluation or when debugging (say, you set the debugger to break on a message/assert). Try e.g. Do[Pause[1], i, 30], then interrupt using Alt-, (Option-Command-. on Mac). Now you can evaluate i to check its value, or examine the kernel state in other ways. Exit the dialog using Return[]. It is natural that one would not want these evaluations to influence $Line once the dialog has finished.
answered Mar 19 at 12:29
SzabolcsSzabolcs
165k15450954
$endgroup$
$begingroup$
Since the behavior is documented I conclude this is the intended design feature. I use NotebookEvaluate for package development, because it is much more convenient way to add new definitions and navigate in the many cell notebook than in plain .m file. I think I will try to add Clear[Out] as the last cell in the external.nb.
$endgroup$
– user18792
Mar 20 at 7:29
$begingroup$
@user18792 You can edit an.mfile as if it were a notebook. You can add section cells and text cells. You can close and open section cells. Try it.
$endgroup$
– Szabolcs
Mar 20 at 8:47
add a comment |
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1 Answer
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oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
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oldest
votes
$begingroup$
I am guessing that this has to do with the following note in the NotebookEvaluate documentation:
The cells of the notebook are evaluated in a dialog subsession.
Here is an example session demonstrating similar behaviour:
See Dialog if you are not familiar with it.
Within the dialog, $Line keeps getting incremented as usual, and Out values are set. But once the dialog finishes, $Line is reset to its original value.
This is documented:
Dialog automatically localizes the values of
$Line,$MessageList, and$Epilog.
Side note: A dialog is something you would normally encounter not when explicitly entering it, but when interrupting evaluation or when debugging (say, you set the debugger to break on a message/assert). Try e.g. Do[Pause[1], i, 30], then interrupt using Alt-, (Option-Command-. on Mac). Now you can evaluate i to check its value, or examine the kernel state in other ways. Exit the dialog using Return[]. It is natural that one would not want these evaluations to influence $Line once the dialog has finished.
answered Mar 19 at 12:29
SzabolcsSzabolcs
165k15450954
$endgroup$
$begingroup$
Since the behavior is documented I conclude this is the intended design feature. I use NotebookEvaluate for package development, because it is much more convenient way to add new definitions and navigate in the many cell notebook than in plain .m file. I think I will try to add Clear[Out] as the last cell in the external.nb.
$endgroup$
– user18792
Mar 20 at 7:29
$begingroup$
@user18792 You can edit an.mfile as if it were a notebook. You can add section cells and text cells. You can close and open section cells. Try it.
$endgroup$
– Szabolcs
Mar 20 at 8:47
add a comment |
$begingroup$
I am guessing that this has to do with the following note in the NotebookEvaluate documentation:
The cells of the notebook are evaluated in a dialog subsession.
Here is an example session demonstrating similar behaviour:
See Dialog if you are not familiar with it.
Within the dialog, $Line keeps getting incremented as usual, and Out values are set. But once the dialog finishes, $Line is reset to its original value.
This is documented:
Dialog automatically localizes the values of
$Line,$MessageList, and$Epilog.
Side note: A dialog is something you would normally encounter not when explicitly entering it, but when interrupting evaluation or when debugging (say, you set the debugger to break on a message/assert). Try e.g. Do[Pause[1], i, 30], then interrupt using Alt-, (Option-Command-. on Mac). Now you can evaluate i to check its value, or examine the kernel state in other ways. Exit the dialog using Return[]. It is natural that one would not want these evaluations to influence $Line once the dialog has finished.
answered Mar 19 at 12:29
SzabolcsSzabolcs
165k15450954
$endgroup$
$begingroup$
Since the behavior is documented I conclude this is the intended design feature. I use NotebookEvaluate for package development, because it is much more convenient way to add new definitions and navigate in the many cell notebook than in plain .m file. I think I will try to add Clear[Out] as the last cell in the external.nb.
$endgroup$
– user18792
Mar 20 at 7:29
$begingroup$
@user18792 You can edit an.mfile as if it were a notebook. You can add section cells and text cells. You can close and open section cells. Try it.
$endgroup$
– Szabolcs
Mar 20 at 8:47
add a comment |
$begingroup$
I am guessing that this has to do with the following note in the NotebookEvaluate documentation:
The cells of the notebook are evaluated in a dialog subsession.
Here is an example session demonstrating similar behaviour:
See Dialog if you are not familiar with it.
Within the dialog, $Line keeps getting incremented as usual, and Out values are set. But once the dialog finishes, $Line is reset to its original value.
This is documented:
Dialog automatically localizes the values of
$Line,$MessageList, and$Epilog.
Side note: A dialog is something you would normally encounter not when explicitly entering it, but when interrupting evaluation or when debugging (say, you set the debugger to break on a message/assert). Try e.g. Do[Pause[1], i, 30], then interrupt using Alt-, (Option-Command-. on Mac). Now you can evaluate i to check its value, or examine the kernel state in other ways. Exit the dialog using Return[]. It is natural that one would not want these evaluations to influence $Line once the dialog has finished.
answered Mar 19 at 12:29
SzabolcsSzabolcs
165k15450954
$endgroup$
I am guessing that this has to do with the following note in the NotebookEvaluate documentation:
The cells of the notebook are evaluated in a dialog subsession.
Here is an example session demonstrating similar behaviour:
See Dialog if you are not familiar with it.
Within the dialog, $Line keeps getting incremented as usual, and Out values are set. But once the dialog finishes, $Line is reset to its original value.
This is documented:
Dialog automatically localizes the values of
$Line,$MessageList, and$Epilog.
Side note: A dialog is something you would normally encounter not when explicitly entering it, but when interrupting evaluation or when debugging (say, you set the debugger to break on a message/assert). Try e.g. Do[Pause[1], i, 30], then interrupt using Alt-, (Option-Command-. on Mac). Now you can evaluate i to check its value, or examine the kernel state in other ways. Exit the dialog using Return[]. It is natural that one would not want these evaluations to influence $Line once the dialog has finished.
answered Mar 19 at 12:29
SzabolcsSzabolcs
165k15450954
answered Mar 19 at 12:29
SzabolcsSzabolcs
165k15450954
answered Mar 19 at 12:29
SzabolcsSzabolcs
165k15450954
answered Mar 19 at 12:29
SzabolcsSzabolcs
165k15450954
165k15450954
$begingroup$
Since the behavior is documented I conclude this is the intended design feature. I use NotebookEvaluate for package development, because it is much more convenient way to add new definitions and navigate in the many cell notebook than in plain .m file. I think I will try to add Clear[Out] as the last cell in the external.nb.
$endgroup$
– user18792
Mar 20 at 7:29
$begingroup$
@user18792 You can edit an.mfile as if it were a notebook. You can add section cells and text cells. You can close and open section cells. Try it.
$endgroup$
– Szabolcs
Mar 20 at 8:47
add a comment |
$begingroup$
Since the behavior is documented I conclude this is the intended design feature. I use NotebookEvaluate for package development, because it is much more convenient way to add new definitions and navigate in the many cell notebook than in plain .m file. I think I will try to add Clear[Out] as the last cell in the external.nb.
$endgroup$
– user18792
Mar 20 at 7:29
$begingroup$
@user18792 You can edit an.mfile as if it were a notebook. You can add section cells and text cells. You can close and open section cells. Try it.
$endgroup$
– Szabolcs
Mar 20 at 8:47
$begingroup$
Since the behavior is documented I conclude this is the intended design feature. I use NotebookEvaluate for package development, because it is much more convenient way to add new definitions and navigate in the many cell notebook than in plain .m file. I think I will try to add Clear[Out] as the last cell in the external.nb.
$endgroup$
– user18792
Mar 20 at 7:29
$begingroup$
Since the behavior is documented I conclude this is the intended design feature. I use NotebookEvaluate for package development, because it is much more convenient way to add new definitions and navigate in the many cell notebook than in plain .m file. I think I will try to add Clear[Out] as the last cell in the external.nb.
$endgroup$
– user18792
Mar 20 at 7:29
$begingroup$
@user18792 You can edit an
.m file as if it were a notebook. You can add section cells and text cells. You can close and open section cells. Try it.$endgroup$
– Szabolcs
Mar 20 at 8:47
$begingroup$
@user18792 You can edit an
.m file as if it were a notebook. You can add section cells and text cells. You can close and open section cells. Try it.$endgroup$
– Szabolcs
Mar 20 at 8:47
add a comment |
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$begingroup$
The kernel state (including In/Out values) is not local to notebooks. This is expected.
$endgroup$
– Szabolcs
Mar 19 at 12:05
$begingroup$
That is clear, however why then not to continue the enumeration from the last Out[ ] value the kernel knows in the new notebook? I find this confusing.
$endgroup$
– user18792
Mar 19 at 12:17
$begingroup$
Right, now I see what you mean.
primary.nbkeeps counting up from 1, yet higher input line values are already set inOutthanks toexternal.nb. It is indeed strange.$endgroup$
– Szabolcs
Mar 19 at 12:22