Units are a neverending story, here's a variant of a problem raised before.

How can i get the minimum of 2 values with Units[Standard] loaded, when one of them could be zero (this loosing its units)?

See also 

• https://www.mapleprimes.com/questions/229640-Units-Disappearing
• https://www.mapleprimes.com/questions/230165-Error-in-UnitsTestDimensions-Invalid
• https://www.mapleprimes.com/questions/230064-Compare-Similar-Units

Download UnitsStandardCompare.mw

I'm doing som XML readin, and need a bit help in using the HasChild function properly.

The attachment shows that using HasChild on a xmltree works fine, but I can't get i working when using it on a xmldocument. The latter is usually the case when you get when you read in from a file.

HasChild.mw

I think  the help file regarding searchtext should be more specific regarding the result of the search.

Using searchtext(pattern, string, range), the result will be an integer which indicates the position of the first character from the beginning of the range - not from the beginning of the string.

One of the examples actually shows that.

How can I sort lists which have tables as entries, and decide upon which entry the sort should be based.

In the attached example each entry in the list has the values material, name and type.

• How would I sort the list based on the material name for example?
• Are there any better methods to define and store the data?

Listsort.mw

Just curious about an output in an if statement.

Why do I need to use Print() in an if statement, when I don't need it otherwise? Why doesn't "hei" show in the output of the attached example?

Printinloop.mw