topic 'All evaluations resulted in either an error or a complex result in Mathcad

'All evaluations resulted in either an error or a complex result

FedexRight — Fri, 05 Jun 2020 10:31:44 GMT

I am getting error as 'All evaluations resulted in either an error or a complex result.

Re: 'All evaluations resulted in either an error or a complex result

LucMeekes — Fri, 05 Jun 2020 11:57:04 GMT

You have redefined x to become an array, between the definition of F(x) and the plot.

If you move the plot upper left corner to just above the redefinition of x to an array, your plot should show.

The error message "All evaluations..." is cryptic at first sight. In this case case 'all evaluations resulted in an error' applies, because you cannot compare a singular value (such as -1, 2 or 5 with an array (that you redefined x to).

Success!

Luc

Re: 'All evaluations resulted in either an error or a complex result

-MFra- — Fri, 05 Jun 2020 15:24:27 GMT

Re: 'All evaluations resulted in either an error or a complex result

LucMeekes — Fri, 05 Jun 2020 15:41:13 GMT

The definition of F(x) was not the cause of the problem of the OP.

He redefined x to be a 4 element array between the definition of F(x) and the plot (not shown in his picture). That would fail with your definition of F(x) as well.

Luc

Re: 'All evaluations resulted in either an error or a complex result

Werner_E — Sun, 07 Jun 2020 19:35:33 GMT

Luc already explained why your plot failed - the definition of x as a vector.

Here are a few more suggestions and an explanation, why F(x) fails if x is a vector.
If you are new to this, I understand that the difference between a range and a vector can be quite confusing.

MC15 worksheet attached

Re: 'All evaluations resulted in either an error or a complex result

-MFra- — Mon, 08 Jun 2020 07:57:21 GMT

You're absolutely right. My answer is based on what the photo shows. Only now I have opened the file provided by FedexRight.