Cannot calculate any formula containing 'e'

[Niklas Wenzel]

How to reproduce:

Type in 'e^2' or 'e+3' and press enter. Nothing is calculated.

[Riccardo Padovani (rpadovani)]

Confirmed. There is only to change line 169 of app/engine/formula.js from E to e

[Bartosz Kosiorek (gang65)]

Very strange. It is working perfectly for me.
I tested it on BQ phone and on Desktop (by using physical keyboard).

In engine "E" is for Euler number and "e" is for big/small numbers eg. "10e+1.5".

[Riccardo Padovani (rpadovani)]

Uh, right, wrong fix.

Anyway, I can confirm the bug, trunk on vivid.

Which version of Ubuntu are you using? And qmlscene?

apt-cache show qmlscene | grep Version
Version: 5.4.1-1ubuntu7

[Riccardo Padovani (rpadovani)]

Actually, it doesn't happen each time the app is launched, only something like 3 times every 5.

The error is `qml: Error: math.js TypeError: Type error engine formula:E+1.5`, so it's raised by the engine.

I was unable to reproduce it with upstream library, so we need to find why it fails randomly. I was able to see it fail also on phone with OTA-4

[Bartosz Kosiorek (gang65)]

I'm using 15.04:
apt-cache show qmlscene | grep Version
Version: 5.4.1-1ubuntu5

On BQ phone I'm using stable image.

[Niklas Wenzel (nikwen)]

I was referring to the Euler number here.
However, it's a strange bug as I am right now unable to reproduce it again as well while yesterday evening I was unable to get it working properly...

[Marco (jermy-07)]

Can reproduce. What should I do?

[Bartosz Kosiorek (gang65)]

Could you please check if it is still an issue with latest calculator version?
Last time we upgraded math.js to 2.4, and this issue could be resolved.

[Niklas Wenzel (nikwen)]

It took me about 10 to 15 tries but then I constantly hit the problem again. (Tested on the desktop.)

[Bartosz Kosiorek (gang65)]

I reproduced bug with following script. Seems it is an bug in math.js
The bug was already submitted:
https://github.com/josdejong/mathjs/issues/505

[Wjosdejong (wjosdejong)]

@Bartosz I can't manage to reproduce the issue using your code example in some existing Qt project that I had. It just works fine no matter how many times I press "Click me to calculate". The zip file you attached in #11 does not contain any project settings, I guess these can be relevant? (for example, I could not run the math.js code at all in Qt due to a statement `math.import(...)` which Qt doesn't like, apparently you have some settings allowing this in your Qt project?).

Can you provide a script example including Qt project settings and everything?

[Bartosz Kosiorek (gang65)]

you need to restart whole qml application 20 times to reproducevthat issue. With clicking you will not reproducevthat issue.

[Bartosz Kosiorek (gang65)]

I run this Qml application directly from console: qmlscene hello.qml.
Do you know how to get such project settings?

[Marco (jermy-07)]

Reproduced by clicking the text and closing 20 times:

$ for i in {1..20};do qmlscene hello.qml;done
file:///tmp/hello-bignumber-euler-number/math.js:33727: TypeError: Type error

[Wjosdejong (wjosdejong)]

@Bartosz No idea, just a guesst. I tried to run your code from #11 via the Qt editor, that throws an exception:

    file:///home/jos/tmp/test7/math.js:117 Expected token `identifier'

So I was just wondering how you guys get this code running at all... All I can think of (not being familiar with Qt) is we have different versions of stuff, or different project settings or something like that. I'm running Linux Mint 17.2 64-bit, qmlscene 5.2.1.

Besides that, when I change line 117 from `math.import(....)` to `math['import'](...)` I can run the code.

@Marco thanks. I run your loop starting the code 20 times, click the text, and close them one by one. Just works fine.

[Marco (jermy-07)]

Not sure why you can't reproduce. 20 was just a rough estimate and hope it is sufficient to trigger at least once.

$ qmlscene --verbose
Qt 5.5.1 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 5.1.1 20150618 (Red Hat 5.1.1-4))