Issue: Range behaviour

Question

Hi,

*** I attached a Mathcad sheet exemplifying the issue***

I have a variable j defined below:

This variable can take values like [1], [2], etc. except when type is 12, in which case j=[0,1,2,...,11]

My idea is that the user can select an individual type or select type=12, which includes all types from 0 to 11..

When I multiply two vectors using j to access their elements, it works as intended:

The problem occurs when I want to store this result in a variable.

I want to get rid of those zeros and mimic the C_j * M1_j results shown above. I tried to create a another variable i but for some reason it gives an error:

I wonder if there is a cleaner/easier way of doing this?

Regards,

Werner_E · Accepted Answer

I see no need for any variable "j" - neither as a range, nor as a vector.

You may use the if-function:

Note that you need to apply vectorization when calculating C*M1.

If you need the variable T to be a vector/matrix even though it consists of just one value, you can do it that way:

and of course you don't have to use the if-function, you can also use the programmed if-statement

Prime 9 worksheet attached

LucMeekes · Answer

With the statement:you are simply multiplying two array elements (which are scalars in your case) for every value of j.If j is a single value, you get a single value as result. If j is a range, you get a range of results:one result for each product of C[j and M1[j.With the assignment:you are creating array elements for each value in the range of j. If j is a single value, say 3, the array T gets created with 4 elements, one with index 0, the second with index 1, third with index 2 and fourth with index 3 (because j=3). The first three are created by default, and set to 0. (You have ORIGIN=0, so indexing starts at 0, another common setting for ORIGIN is 1, so indexing starts at 1 and with the same value j=3 you would get for T a 3-element vector, the first 2 being 0 and the third containing the product C[3*M1[3.Hope this sheds some light.You could solve it by:Success!Luc

Sign up

Please use your PTC eSupport account.

Welcome to the PTC Community

Please use your PTC eSupport account.

Scanning file for viruses.

This file cannot be downloaded