topic Re: Possible Mathcad error in Mathcad

Possible Mathcad error

gatlas — Fri, 30 Jan 2026 21:48:29 GMT

Team,

Please see this file. I believe Mathcad gives the wrong answer for the indefinite integral of ((-1)^x)dx.

Let me know what you think.

Regards,

Glen

Re: Possible Mathcad error

LucMeekes — Fri, 30 Jan 2026 23:03:09 GMT

I guess you're right:

What version of Prime are you using?

Success!
Luc

Re: Possible Mathcad error

gatlas — Fri, 30 Jan 2026 23:12:11 GMT

Luc,

I'm using Mathcad Prime 11.

Regards,

Glen

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Re: Possible Mathcad error

Werner_E — Sat, 31 Jan 2026 02:07:37 GMT

Yes, I would call it a bug in the symbolic engine and its already present in Prime 9 (can't test P8 or P7 as I don't have those versions installed).

Modifiers 'rectangular' or 'complex' don't help and also not writing it as a definite integral

and also

As Luc has shown it works OK in MC11 (with Maple as symbolic engine).

It also works OK in MC15 (with muPad as symbolic engine)

(The definite integral differs just by a constant i/pi which is OK)

Re: Possible Mathcad error

DJNewman — Mon, 02 Feb 2026 17:09:46 GMT

Have you opened a case with PTC Support?

Re: Possible Mathcad error

gatlas — Mon, 02 Feb 2026 17:15:11 GMT

No. I have not.

Re: Possible Mathcad error

gatlas — Tue, 03 Feb 2026 01:33:39 GMT

DJ,

Kindly inform me how to open a case with PTC.

Thanks,

Glen

Re: Possible Mathcad error

DJNewman — Tue, 03 Feb 2026 14:42:37 GMT

Sure. Log on to PTC Support and then go to https://www.ptc.com/en/support/case-logger

Then follow directions and prompts. Be sure to attach your Mathcad worksheet.