toString

[Doug]

When I'm running examples to decide how to automate computations, I find myself having to type a semi-colon followed by toString on just about every line to defeat M2's desire to print exponents on a separate line, when I want something I can cut and paste into a new input line instead. Is there any way to get Macaulay 2 to default print strings to the screen?

Doug Leonard

[Doug Torrance]

One way to accomplish this would be to redefine the "net" method (which is called when printing) for the given ring to just be "toString".  For example:

i1 : R = QQ[x,y,z]

o1 = R

o1 : PolynomialRing

i2 : net R := toString

o2 = toString

o2 : MethodFunctionSingle

i3 : random(2, R)

o3 = 8*x^2+(6/5)*x*y+(2/7)*y^2+3*x*z+(9/2)*y*z+(4/7)*z^2

o3 : R

[Douglas Leonard]

That's great. 

But I'm dealing with a nested string of maybe 20 or so rings. Can I set this once at the beginning of a session so that it applies to any ring I define?

Doug Leonard

---

From: maca...@googlegroups.com <maca...@googlegroups.com> on behalf of Doug Torrance <douglas.a...@gmail.com>
Sent: Thursday, August 14, 2025 2:17 PM
To: Macaulay2 <maca...@googlegroups.com>
Subject: [Macaulay2] Re: toString

 

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[Doug Torrance]

One way to do that would be to override "net" for various subclasses of Expression.  I think Power (to fix exponents), Product (so we get * after coefficients) and Divide (for rational coefficients) should be sufficient.  So something like:

i1 : net Power := net Product := net Divide := toString

o1 = toString

o1 : MethodFunctionSingle

i2 : R = QQ[x,y]; S = QQ[z,w];

i4 : random(2, R)

o4 = (12/7)*x^2 + (3/10)*x*y + (23/6)*y^2

o4 : R

i5 : random(2, S)

o5 = (79/9)*z^2 + (22/3)*z*w + (39/4)*w^2

o5 : S

[Douglas Leonard]

That seems to work.

I had to do Subscript as well;

but I don't know how to supress the rows of of hyphens

Produced when a list is longer than one line. 

Doug Leonard

---

From: maca...@googlegroups.com <maca...@googlegroups.com> on behalf of Doug Torrance <douglas.a...@gmail.com>

Sent: Thursday, August 14, 2025 2:59 PM
To: Macaulay2 <maca...@googlegroups.com>
Subject: Re: [Macaulay2] Re: toString

 

To view this discussion visit https://groups.google.com/d/msgid/macaulay2/f49c5f12-717c-423c-95f0-93e4078b9179n%40googlegroups.com.

[Doug Torrance]

The "printWidth" variable controls when we wrap the output.  If it's set to 0, then we don't wrap at all.  For example:

i1 : R = ZZ/2[x_0..x_50];

i2 : random(1, R)

o2 = x  + x  + x  + x  + x   + x   + x   + x   + x   + x   + x   + x   + x   +
      1    2    5    6    10    11    13    14    16    18    20    21    23  
     --------------------------------------------------------------------------
     x   + x   + x   + x   + x   + x   + x   + x   + x   + x   + x   + x   +
      25    27    29    30    31    35    36    41    42    43    44    45  
     --------------------------------------------------------------------------
     x   + x
      47    50

o2 : R

i3 : printWidth = 0

o3 = 0

i4 : random(1, R)

o4 = x  + x  + x  + x   + x   + x   + x   + x   + x   + x   + x   + x   + x   + x   + x   + x   + x   + x   + x   + x   + x   + x   + x   + x   + x   + x   + x   + x
      0    5    7    11    13    14    15    17    19    21    22    25    26    27    28    29    31    33    35    38    39    40    42    43    46    47    49    50

o4 : R