MATLAB Answers

Keyboard shortcut to evaluate current line?

815 views (last 30 days)
Chad Greene
Chad Greene on 2 Jun 2014
Commented: Sinan Islam on 13 Nov 2020
I often use a keyboard shortcut to evaluate highlighted selections of a script I'm working on. But often, I will add a single line to a script and want to evaluate it right away. To do this I highlight the line and hit F9, but it would be a smoother process if I could simply hit F10 to evaluate the line my cursor is on without needing to highlight the line. I've checked the Preferences and I don't see this option available. Are there any clever hacks to allow this?
I'm using R2012b on a Mac.

Accepted Answer

Eric
Eric on 27 Mar 2015
Edited: Eric on 27 Mar 2015
Create a Quick Access Toolbar shortcut for doing this and call it "Run line". Here's the code:
currentEditor = matlab.desktop.editor.getActive;
originalSelection = currentEditor.Selection;
assert(originalSelection(1)==originalSelection(3));%Check that multiple lines are not selected
currentEditor.Selection = [originalSelection(1) 1 originalSelection(1) Inf];%Select the whole line
eval(currentEditor.SelectedText);%Run the whole line
currentEditor.Selection = originalSelection;%Reset selection to original state
clear currentEditor originalselection
Now, press and hold the Alt key (at least in Windows) to see the mnemonics for the Quick Access Toolbar items. On my system a little "5" shows for the "Run line" shortcut.
Hence I can press Alt+5 to run the current line and leave my selection unchanged. Alternatively I could use the mouse to click the "Run line" button on the Quick Access Toolbar.
-Eric
  24 Comments
Sinan Islam
Sinan Islam on 13 Nov 2020
I cant believe this! I cant believe that I need to write a complex script to get the most basic functionality in the free languages, Python and R. Where is the awesome productivity that MATLAB promise? False marketing!

Sign in to comment.

More Answers (5)


Sean de Wolski
Sean de Wolski on 2 Jun 2014
I don't know of this option but I do understand the use-case and agree that it would be valuable. Here's how I do it right now:
When writing a script, I always use lots of code sections.
Since you can evaluate a section from keyboard or from the "run section" button there is always the option to evaluate the section. If you intelligently name your variables so that they don't overwrite previous ones, then you will never have trouble running the whole section versus just the line of code. I'll also put computationally expensive lines of code in their own section so that it only needs to be rerun if the higher-level sections have changed.
This mimics the functionality you desire and actually expands it to multiple lines at once.
  1 Comment
Chad Greene
Chad Greene on 2 Jun 2014
Indeed, I also use sectioning quite a bit. I was hoping for a single-line equivalent. I effectively want a new cell for each line of code without actually adding the %% between each line. It's only a minor inconvenience to highlight some new xlim line and hit F9 after data have already been plotted, but it would be less clunky if the current line could be evaluated with a single keystroke.

Sign in to comment.


Benjamin Bechtel
Benjamin Bechtel on 19 Aug 2014
Unfortunately I don't have a answer, but I'd be interested too. Did you find a way?
  3 Comments
Brian
Brian on 27 Mar 2015
I agree wholeheartedly and would love to see this feature request completed! How do we go about getting our request known?

Sign in to comment.


Joseph Cheng
Joseph Cheng on 19 Aug 2014
Edited: Joseph Cheng on 19 Aug 2014
This is not entirely 1 button press but you can use the documentation here http://blogs.mathworks.com/community/2009/09/28/configurable-keyboard-shortcuts-have-arrived/ and configure a shortcut to do this. My test (in windows R2011A and R2013b) was to assign "evaluate selection" to F8 and "Selection End Line" to F8. I kept the "limit" keystroke selection to 1.
So by doing this F8 now either:
  1. if something is selected runs the selection
  2. with nothing selected the first F8 press highlights from my cursor to the end of line then upon second F8 press it runs selection.
I see now that i could have just mapped it to F9 as its performance is conditional to what is selected.
Not entirely sure how much faster this is. Normal keyboard way would be home->shift+end->F9 which is just 4 presses. My method would save you a key press as its home->F8->F8.
  1 Comment
Brian
Brian on 27 Mar 2015
I can't get this to work in R2015A. They list a possible conflict between the two actions and F8 ends up only evaluating, it does not perform selection end line.
BUT, I did discover that single clicking the white margin to the left of your text (between the grey debug "-" (after the line number) and the first letter on your line) will select the entire line. Thus, clicking that margin and then pressing F9 completes what we are trying to accomplish... still wish we could just have one keybind for evaluating the current line.

Sign in to comment.


Rodrigo Coelho
Rodrigo Coelho on 3 Mar 2018
Anybody knows how to get the keyboard mnemonics for Mac?
  2 Comments
Arun Das
Arun Das on 31 Mar 2018
On Mac, select the lines to run; then press:
fn + shift + F7

Sign in to comment.

Products

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!