In Mathcad Prime 2 you have this feature where if you change anything at the top of a worksheet it automatically recomputes all subsequent formulas that are affected by the correction. It figures out which of the formulas are now affected by this change and recomputes only those formulas, leaving everything else intact.
Is there a way to do the same thing in ipython. If I change a cell, ipython should first find out which other cells now contain wrong results and have to be recomputed. Then it should automatically recompute only those cells.
Cells/Notebooks have no knowledge of dependencies, but you can use the kernel restart, and cell run-all or run all-below to refresh all the notebook.
Related
I created a new spreadsheet with LibreOffice 6.4 and noticed that formulas do not execute (and recalculate). So, when I write =1+1 or =A1+A2 (with values in those cells), nothing happens. Likewise, when I copy and paste formulas from older spreadsheets, nothing happens either.
I have found some advice in various forums that point to Tools->Options and LibreOffice->Preferences (since I have a Mac). One source tells me that auto-recalculation is disabled for reasons of backward compatibility with Excel (what I do not understand as I just created a new file).
I have enabled 'Always recalculate' for both options in LibreOffice->Preferences (Option LibreCalc->Formula):
Nothing in the 'Calculate' Option tab seems to indicate anything in this direction.
This seems not to change anything. What am I missing?
How can I make sure that everything always recalculates and always executes all my formulas?
Thanks!
Try this:
Select your range ; hit CTRL+H ; Found = ^. ; Replace = & ; check "regular expressions" box below ; "replace all" button;
It works better if you create a new empty spreadsheet and then paste your data.
What worked today under Windows only: Re-create the formula in a new column. After it works correctly, Copy or Move the new cell into the old position, overwriting everything in the cell that was not calculating.
In my notebook, I have a cell returning temp calculation results. It's a bit long, so after it is run, I want to hide it and when needed, to show it.
To do it manually, I can double click the left side of the output, to hide it
After double click
But is there any way I can do this by code? For example,
the last line of the cell, use a command like %%hide output, and the output would be hidden after finished running.
Additionally, can I get this feature in output HTML?
Add ; by the end of the cell to hide the output of that cell.
In the newer versions(5.0.0 at the time I'm writing this), pressing o in the command mode hides the output of the cell in focus. The same happens if you triple click in front of the output.
o is
the first letter in the word "output" or
lower case of 15th letter in the alphabet
You can add %%capture to the beginning of the cell.
Jupyter provides a magic cell command called %%capture that allows you to capture all of to outputs from that cell.
You can use it like this:
%%capture test
print('test')
test.stdout => 'test\n'
https://ipython.readthedocs.io/en/stable/interactive/magics.html
In newer versions of Jupiter Notebook, select the desired cell, make sure you're in command mode and then on the menubar press Cell > Current Outputs. You have then three options:
Toggle (press O in the command mode to apply the same effect)
Toggle Scrolling (the default output)
Clear (to clear the output all together)
Image to Menubar Options
Additionally, you can apply the same effect to all the cells in your document if you chose All Output instead of Current Output.
Not exactly what you are after, but the effect might be good enough for your purposes:
Look into the %%capture magic (https://nbviewer.jupyter.org/github/ipython/ipython/blob/1.x/examples/notebooks/Cell%20Magics.ipynb). It lets you assign that cell output to a variable. By calling that variable later you could see the output.
Based on this, I just came up with this for myself a few minutes ago:
%%javascript
$('#maintoolbar-container').children('#toggleButton').remove()
var toggle_button = ("<button id='toggleButton' type='button'>Show Code</button>");
$('#maintoolbar-container').append(toggle_button);
var code_shown = false;
function code_toggle()
{
if (code_shown)
{
console.log("code shown")
$('div.input').hide('500');
$('#toggleButton').text('Show Code');
}
else
{
console.log("code not shown")
$('div.input').show('500');
$('#toggleButton').text('Hide Code');
}
code_shown = !code_shown;
}
$(document).ready(function()
{
code_shown=false;
$('div.input').hide();
});
$('#toggleButton').on('click', code_toggle);
It does have a glitch: each time you run that cell (which I put at the top), it adds a button. So, that is something that needs to be fixed. Would need to check in the maintoolbar-container to see if the button already exists, and then not add it.
EDIT
I added the necessary piece of code:
$('#maintoolbar-container').children('#toggleButton').remove()
You can use the notebook utils from https://github.com/google/etils:
!pip install etils[ecolab]
from etils import ecolab
with etils.collapse():
print('This content will be hidden by default')
It will capture the stdout/stderr output and display it a some collapsible section.
Internally, this is more or less equivalent to:
import contextlib
import html
import io
import IPython.display
#contextlib.contextmanager
def collapse(name: str = ''):
f = io.StringIO()
with contextlib.redirect_stderr(f):
with contextlib.redirect_stdout(f):
yield
name = html.escape(name)
content = f.getvalue()
content = html.escape(content)
content = f'<pre><code>{content}</code></pre>'
content = IPython.display.HTML(
f'<details><summary>{name}</summary>{content}</details>')
IPython.display.display(content)
The section is collapsed by default, but I uncollapsed it for the screenshot.
To prepend a cell from getting rendered in the output, in the notebook, by voilo or voila gridstack, just put in the first line of each cell to hide the output:
%%capture --no-display
reference in ipypthon documentation
For Windows,
in Jupyter Notebook, click the cell whose output you want to hide.
Click Esc + o for toggling the output
So I totally understand. When you have like 100 different plot and when you do the "Restart & Run All" those ugly plots all show up again
what you can do is ctrl+A and press o it will all of a sudden hide all your cells!!! For you to collapse automatically, you may need to use JupyterLab (another level after JupyterNotebook) but still, by doing ctrl+A then o you will be able to collapse all the results!!!
ctrl+A --> select ALL (make sure to click outside of coding box before you do it!)
o --> toggle collapse
If you don't mind a little hacking, then you may write a simple script for inverting the "collapsed" attribute of each cell from false to true
in the notebook .ipynb file (which is a simple JSON file).
This is however may fail in the future if a the .ipynb format changes.
Is it possible to comment out whole cells in jupyter?
I need it for this case:
I have a lot of cells, and I want to run all of them, except for a few of them. I like it that my code is organized in different cells, but I don't want to go to each cell and comment out its lines. I prefer to somehow choose the cells I want to comment out, then comment them out in one go (so I could later easily uncomment them)
Thanks
Mark the content of the cell and press Ctrl+ /. It will comment out all lines in that cell. Repeat the same steps to uncomment the lines of your cell.
I think the easiest thing will be to change the cell type to 'Markdown' with M when you don't want to run it and change back to 'Code' with Y when you do. In a short test I did, I did not lose my formatting when switching back and forth.
I don't think you can select multiple cells at once.
If you switch the cell to 'raw NBConvert' the code retains its formatting, while all text remains in a single font (important if you have any commented sections), so it remains readable. 'Markdown' will interpret the commented sections as headers and change the size and colour accordingly, making the cell rather messy.
On a side note I use this to interrupt the process if I want to stop it - it seems much more effective than 'Kernel --> Interrupt'.
You can switch the cell from 'Code to 'Raw NBConvert'
I have text files which contain code inside an Editor. The user can run an analysis on a certain part of his code, which will result in a set of lines which should be hidden. Next I want to present the user with only the remaining lines, but with correct linenumbers, as from the original document. Possible solutions I thought of:
Open a new Editor which does not contain the hidden lines, but *somehow* still has correct line numbers
Hide the lines in the original editor, and offer a button for the user to 'unhide'. Probably a similar solution required as in 1.
I don't really know how to go about this. Folds would be a weird solution, because they can be unfolded individually, and seem to be more semantically tied to things like methods or classes. Also, simply creating a new document without the hidden lines results in wrong linenumbers.
Use a ProjectionViewer and reflection to invoke the private method ProjectionViewer.collapse(int offset int length). This method is only used internally to hide a certain portion of the text, by manipulating the ProjectionDocument (see http://eclipse.org/articles/Article-Folding-in-Eclipse-Text-Editors/folding.html).
After this, folding text in the editor using the annotations(the little +/- icons) WILL break everything, so this solution and regular folding are mutually exclusive.
I need to add .jpg at the end of all he cells in one or more columns
9788895249971 into > 9788895249971.jpg
9788867230129 into > 9788867230129.jpg
9788867230273 into > 9788867230273.jpg
9788867230280 into > 9788867230280.jpg
Detailed step-by-step instructions are much appreciated since I am very new to Calc.
Thanks
Do you need to do this once or is this going to be a repeated task every week/month?
If it is something you need to do just once, here is what you can do:
Next (right) to the column where your numbers are open (insert) a new column.
Assuming the following: Numbers are in column A, New column is column B.
In this new column B in the top cell (B1) write:
=A1&".jpg"
Now copy B1 all the way down to the end. In B1 type [Ctrl]+c then Hold [Shift] and hit [PgDn] until the end then press [Ctrl]+v.
Highlight Column B, [Ctrl]+c, then [Edit] [Paste Special] values only (No formula's) this freezes the calculated data.
This is just another option,
just click the function wizard and select concatenate, in that enter which column you want to enter as text1 as and second column in text2. Then when you click OK you will get an concatenated column like below image
so in the C column you will get as a1.jpg.
For those who continue to find this question (as I did):
This can be quickly done using regular expression option of find and replace. (I don't know what version of Calc introduced regex searches, but 6.2.4 has it.)
If you only want to update some non-blank cells on the sheet, select them.
Choose Find and Replace.
On the dialog, fill in the following:
Enter $ for the Find value. ($ means end of line in regex, or in this context end of cell value.)
Enter the desired suffix (.jpg in the question) for the Replace value.
Check Regular Expressions under Other Options
Check Current Selection Only under Other Options if you want to limit to the cells selected in step 1.
Uncheck All Sheets unless that is what you want.
Choose Replace All
This will update the values in-place and does not require any additional columns or formulas.
There's a much more elegant way to do this that doesn't require sacrificing cells just to hold data types, and can be scaled to work with one cell or a large chart range.
Add both pieces of data into the =CONCAT() function
Make sure to use CONCAT instead of CONCATENATE, as `CONCAT accepts cell ranges and is more dynamic.
Open the Function Wizard on the cell in question, and build the following function:
=CONCAT(<your_data>," <suffix>",...)
# Make sure to add a space before the suffix so it appears in the cell.
# You can use this with as many input variables as required letting
# you add as many strings, formulas, or numbers together.
The result should be something like this. In my example, the cell in question is the final value of Ethereum on a balance sheet:
The above example was an easy one, since it was being used as a test, all my summed values were ints, if I had floating point numbers, they would run away to max decimal places (not very pretty).
The function will drag out and expand intelligently to other cells like any other formula.
Adjusting accuracy of floating point values inside a CONCAT function
Sometimes, adding a cell results in a rounding problem, or an extreme amount of decimal places. You can further nest your function using ROUND(<your_data>,<decimal_places>)
Your function would look like this:
=CONCAT(ROUND(<cell_range>, ".jpg")
In your specific case, you don't need a space in the second argument as you want to append .jpg directly to the end of the string.
`
Using Macros to automate the entire process
This is extremely repeatable, and using the Macros feature, you can automate these to make much more simplified functions that allow you to enter just the variables you need, while the macro does the work in the background.
Based on Emmanuel Angelo R.’s answer, I would advice learning to differentiate between fixed cell references and dynamic ones. The following applies:
Cell A1 contains the suffix you would like to add, e.g. ‘.jpg’
Row 2 contains headings, e.g. B2 = ‘Old Filename’ and ‘New Filename’
Cells A3:A¹ contain your filenames
Cells B3:B contain you concatenation formula
In cell B3, type =concatenate(A3;$a$1).² If your locale requires comma as separator, replace my semicolons with commas. Copy cell B3 by selecting it and pressing Ctrl + C. Move the cursor to cell A3, press Ctrl + ↓ (down arror on your cursor keys); this will move you to the bottom of the list of file names. Move your cursor right, then press Ctrl + Shift + ↑; this will select all cells up to the last cell with contents (the one you just wrote your formula in). Press Ctrl + V to paste your contents.
Adding dollar signs in front of your row/column coordinates, will lock that coordinate when pasted. Say you had a list of file types in cells b1–z1 (e.g. jpg, jpeg, tga, bmp, png et c.). An easy way to create the formula would then be by first typing it in cell B3 as =concatenate(A3;B$1), then paste it to every cell till the end of your file names list (cell z3); these cells would then read …A3;b$1, …A3;C$1 et c. When copying it for all the rows below
You could select the entire range of cells with formulas in row 3 and run a search and replace, replacing all instances of ‘A3;’ by ‘A3;$’, effectively inserting a dollar in front of all the cell references, allowing you to, should the need arise, copy it horizontally as well as vertically (the latter being covered by the $ in front of 1).
¹ This means cells from A3 and however far down your sheet goes
² Strictly speaking, it is only necessary to type it as a$1.