persistent()
Programming
persistent() is a MATLAB®-compatible programming function for declare variables that retain their values between calls to the same function. initialise to `[]` on first declaration; check with `isempty()`. Run it online in your browser with SimLab — free, no install, no license required.
Declare variables that retain their values between calls to the same function. Initialise to `[]` on first declaration; check with `isempty()`.
Syntax
persistent x
persistent x y z
Examples — run persistent() in your browser
function n = counter() persistent count if isempty(count); count = 0; end count = count + 1; n = count; end▶ Run
See Also
Frequently Asked Questions about persistent()
Is the persistent() function free to use in SimLab?
Yes. SimLab is 100% free — no signup, no license, and no usage limits. You can run persistent() and 510+ other MATLAB®-compatible functions directly in your browser at simulations4all.com/simlab.
Do I need to install MATLAB to use persistent()?
No. SimLab runs entirely in your web browser with zero installation. The persistent() function works without any MATLAB® license or software download.
What does persistent() do?
Declare variables that retain their values between calls to the same function. Initialise to `[]` on first declaration; check with `isempty()`. It is a MATLAB®-compatible programming function available in SimLab with the same calling syntax as MATLAB® — typically: persistent x.
Can I run persistent() in my browser?
Yes. Open SimLab at simulations4all.com/simlab, write or paste code that calls persistent(), and run it. Execution happens locally in your browser — no data leaves your machine.
Try SimLab — MATLAB®-compatible, free, in your browser
510+ functions. Runs in your browser. No install. No license.
Open SimLabMATLAB® is a registered trademark of The MathWorks, Inc. SimLab is an independent project by Simulations4All and is not affiliated with, endorsed by, or sponsored by The MathWorks, Inc.