iterated for loop in Macaulay2

[Reginald Anderson]

Hello,

I'm fairly new to Macaulay2 and am just trying to get an iterated for-loop to work. Something like 

for i from 0 to 5 do(
    for j from 0 to 2 list i+j )

seems to be giving me trouble. At best I can get the input to go in with no error message, but also no output.

[Paul Zinn-Justin]

try

for i from 0 to 5 list( for j from 0 to 2 list (i+j) )

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[Reginald Anderson]

Solid! Thanks

[Frank Moore]

Let's break down your code:

The first line:

for i from 0 to 5 do (

performs what is in the parenthesis over the specified range.

Then the second line

for j from 0 to 2 list i+j )

creates a list of length three with the specified entries.  However, since the outer for loop is just a "do", the results of the command inside the for loop is discarded unless it is stored in some kind of variable.  That is why nothing is returned.

It looks like you perhaps want:

for i from 0 to 5 list (

    for j from 0 to 2 list i+j )

Best,

Frank

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Dr. W. Frank Moore
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Department of Mathematics and Statistics

Wake Forest University

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[Reginald Anderson]

Hi Frank,

Excellent. I see that for

for i from 0 to 5 do( J := for j from 0 to 2 list i+j ; print J )
I receive

{0,1,2} {1,2,3} {2,3,4} {3,4,5} {4,5,6} {5,6,7}

Thank you.