m-graph.mkiv format bug

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Alan BRASLAU

15 Oct 2012 15 Oct '12

9:19 a.m.

There is a bug with format() as redefined in m-graph.mkiv 1e10 and 1e-10 truncate the tailing 0. (I have not been able to fix the code...) Alan Minimal example: \usemodule [graph] \starttext \startMPpage label(format("@g","1e-10"),(0, 0)) ; label(format("@g","1e+10"),(2cm, 0)) ; label(format("@g","1e-12"),(0, -.5cm)) ; label(format("@g","1e+12"),(2cm,-.5cm)) ; \stopMPpage \stoptext

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Sietse Brouwer

15 Oct 15 Oct

10:08 a.m.

...

There is a bug with format() as redefined in m-graph.mkiv 1e10 and 1e-10 truncate the tailing 0.

The function strip() is removing 0 throughout the exponent, and I don't know what purpose that might serve. If we never want to remove zeroes, this works: local function strip(s) - return "\\times10^{"..(s:gsub("%+*0*","")).."}" + return "\\times10^{"..(s:gsub("%+*","")).."}" end Note that if the exponent is zero the "× 10^0" will be left out completely, in both the old and the new strip() function. This seems to be by design. Illustration of this behaviour: \usemodule[graph] \starttext \startMPpage label(format("@g","1e+0"),(2cm,-1cm)) ; \stopMPpage \stoptext Cheers, Sietse On Mon, Oct 15, 2012 at 11:19 AM, Alan BRASLAU wrote:

...

There is a bug with format() as redefined in m-graph.mkiv 1e10 and 1e-10 truncate the tailing 0. (I have not been able to fix the code...)

Alan

Minimal example:

\usemodule [graph]

\starttext \startMPpage label(format("@g","1e-10"),(0, 0)) ; label(format("@g","1e+10"),(2cm, 0)) ; label(format("@g","1e-12"),(0, -.5cm)) ; label(format("@g","1e+12"),(2cm,-.5cm)) ; \stopMPpage \stoptext ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

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Alan BRASLAU

10:27 a.m.

On Mon, 15 Oct 2012 12:08:30 +0200 Sietse Brouwer wrote:

...

...
There is a bug with format() as redefined in m-graph.mkiv 1e10 and 1e-10 truncate the tailing 0.

The function strip() is removing 0 throughout the exponent, and I don't know what purpose that might serve. If we never want to remove zeroes, this works:

local function strip(s) - return "\\times10^{"..(s:gsub("%+*0*","")).."}" + return "\\times10^{"..(s:gsub("%+*","")).."}" end

Note that if the exponent is zero the "× 10^0" will be left out completely, in both the old and the new strip() function. This seems to be by design. Illustration of this behaviour:

\usemodule[graph] \starttext \startMPpage label(format("@g","1e+0"),(2cm,-1cm)) ; \stopMPpage \stoptext

Thanks, this "fixes" it for now, but I believe that the strip is intended to remove leading zeros, as in label(format("@g","1e+08"),(2cm,-1cm)) ; I suppose that the correct syntax must be something like the regex s/[+-]*0*\([1-9]\)/\1/ (not sure how to state this in lua gsub()...) Alan

Alan BRASLAU

10:45 a.m.

On Mon, 15 Oct 2012 12:27:27 +0200 Alan BRASLAU wrote:

...

On Mon, 15 Oct 2012 12:08:30 +0200 Sietse Brouwer wrote:

...
...
There is a bug with format() as redefined in m-graph.mkiv 1e10 and 1e-10 truncate the tailing 0.

The function strip() is removing 0 throughout the exponent, and I don't know what purpose that might serve. If we never want to remove zeroes, this works:

local function strip(s) - return "\\times10^{"..(s:gsub("%+*0*","")).."}" + return "\\times10^{"..(s:gsub("%+*","")).."}" end

Note that if the exponent is zero the "× 10^0" will be left out completely, in both the old and the new strip() function. This seems to be by design. Illustration of this behaviour:

\usemodule[graph] \starttext \startMPpage label(format("@g","1e+0"),(2cm,-1cm)) ; \stopMPpage \stoptext

Thanks, this "fixes" it for now, but I believe that the strip is intended to remove leading zeros, as in label(format("@g","1e+08"),(2cm,-1cm)) ;

I suppose that the correct syntax must be something like the regex s/[+-]*0*\([1-9]\)/\1/ (not sure how to state this in lua gsub()...)

Figured it out (and we don't want to strip a leading minus sign): local function strip(s) return "\\times10^{"..(s:gsub("%+*0*([1-9])","%1")).."}" end Alan

Sietse Brouwer

11:03 a.m.

Alan wrote:

...

Figured it out (and we don't want to strip a leading minus sign):

local function strip(s) return "\\times10^{"..(s:gsub("%+*0*([1-9])","%1")).."}" end

Better to anchor the pattern to the start of the string with `^` (and then the nonzerodigitmatching is no longer needed): gsub("^%+*0*", "") Otherwise, you'll get 805 --> 85. --Sietse On Mon, Oct 15, 2012 at 12:45 PM, Alan BRASLAU wrote:

...

On Mon, 15 Oct 2012 12:27:27 +0200 Alan BRASLAU wrote:

...
On Mon, 15 Oct 2012 12:08:30 +0200 Sietse Brouwer wrote:

...
...
There is a bug with format() as redefined in m-graph.mkiv 1e10 and 1e-10 truncate the tailing 0.

The function strip() is removing 0 throughout the exponent, and I don't know what purpose that might serve. If we never want to remove zeroes, this works:

local function strip(s) - return "\\times10^{"..(s:gsub("%+*0*","")).."}" + return "\\times10^{"..(s:gsub("%+*","")).."}" end

Note that if the exponent is zero the "× 10^0" will be left out completely, in both the old and the new strip() function. This seems to be by design. Illustration of this behaviour:

\usemodule[graph] \starttext \startMPpage label(format("@g","1e+0"),(2cm,-1cm)) ; \stopMPpage \stoptext

Thanks, this "fixes" it for now, but I believe that the strip is intended to remove leading zeros, as in label(format("@g","1e+08"),(2cm,-1cm)) ;

I suppose that the correct syntax must be something like the regex s/[+-]*0*\([1-9]\)/\1/ (not sure how to state this in lua gsub()...)

Figured it out (and we don't want to strip a leading minus sign):

local function strip(s) return "\\times10^{"..(s:gsub("%+*0*([1-9])","%1")).."}" end

Alan

Alan BRASLAU

12:21 p.m.

On Mon, 15 Oct 2012 13:03:40 +0200 Sietse Brouwer wrote:

...

Alan wrote:

...
Figured it out (and we don't want to strip a leading minus sign):

local function strip(s) return "\\times10^{"..(s:gsub("%+*0*([1-9])","%1")).."}" end

Better to anchor the pattern to the start of the string with `^` (and then the nonzerodigitmatching is no longer needed): gsub("^%+*0*", "") Otherwise, you'll get 805 --> 85.

Thank you for the suggestion. Tried it, but this doesn't work, so I must be missing something... Of course, with MetaPost 2.0 we will certainly come across such a case with numbers like 1e805. :) Alan

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Alan BRASLAU
Sietse Brouwer