@mmcdara  I was not. Thank you lol

@Carl Love I just wanted to know if there is a way to use forget to make maple forget every calculation in the loop. The way I see it it can forget individual procedures.

Just like the try catch statement where it can catch individual error phrase but if you simply put "catch:" it will catch all errors. I was wondering if an equivalent command was available.

@ecterrab 
Thanks. That clears it up. I accidently put two indices [1,1] instead of [1] and was expecting an error but it calculated a vector so was just curious what it meant.

 

@Carl Love Thank you for your response. How would i go about setting up multiple evaluations in a loop one after another. for example, if in your example, I was evaluating 1/R and then 1/(R-1) and then 1/(R-2).
I dont seem to be able to use catch and next again for the next statement.

Thank you.

@nm Thank you so much!

Is it possible to use this to get field equations for gravity by using a (modified gravity) Lagrangian?

@rlopez This is absolutely amazing. Thank you!

@Carl Love  This is perfect. Thank you so much!!!

@Carl Love
It should include [a,b+c], it was an error on my part.
for [a,b,c,d] I want the following kind of output.
[[a,b,c,d],[a+b,c,d],[a+c,b,d],[a+d,b,c],[a,b+c,d],[a,b+d,c],[a,b,c+d],[a+b,c+d],[a+c,b+d],[a+d.b+c],[a+b+c,d],[b+c+d,a],[c+d+a,b],[a+b+d,c]]

Thank you.