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Dear Hans,

I read the =E2=80=9Cluametafun.pdf=E2=80=9D and run the codes one by =
one.
It is a really nice to have those figures easily.

During the reading, I found that there is a difference between the =
figure in the manual and the output of my run.
I run the following code at page 24-25 in =E2=80=9Cluametafun.pdf=E2=80=9D=
.

\startMPcode{doublefun} draw lmt_contour [
xmin =3D 0, xmax =3D 4*pi, xstep =3D .05,
ymin =3D -6, ymax =3D 6, ystep =3D .05,
levels =3D7,
height =3D 5cm,
preamble =3D "local sin, cos =3D math.sin, math.cos",
function =3D "cos(x) + cos(y)"
background =3D "bitmap",
foreground =3D "edge",=20
linewidth =3D 1/2,=20
cache =3D true,
];=20
\stopMPcode


In the output, the background of text is gray while the background of =
text in the manual is white.
Here are versions of LuaMetaTeX and ConTeXt which I use.

%%%%%%%
This is LuaMetaTeX, Version 2.03.4=20
open source     > level 1, order 1, name 'cont-yes.mkiv'
system          >=20
system          > ConTeXt  ver: 2019.12.16 18:54 MKIV beta  fmt: =
2019.12.17  int: english/english
system          >=20
%%%%%%%%%

Is there anything that I miss?
Would you please to check it?

Thank you.

Best regards,

Dalyoung=

--Apple-Mail=_017FE04B-CDD6-4124-9F43-D750CF9C9A66
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=utf-8

<html><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space;" class=3D"">Dear Hans,<div =
class=3D""><br class=3D""></div><div class=3D"">I read the =
=E2=80=9Cluametafun.pdf=E2=80=9D and run the codes one by one.</div><div =
class=3D"">It is a really nice to have those figures easily.</div><div =
class=3D""><br class=3D""></div><div class=3D"">During the reading, I =
found that there is a difference between the figure in the manual and =
the output of my run.</div><div class=3D"">I run the following =
code&nbsp;<span style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, =
0);" class=3D"">at page 24-25&nbsp;</span>in =
=E2=80=9Cluametafun.pdf=E2=80=9D.</div><div class=3D""><br =
class=3D""></div><div class=3D""><div style=3D"color: rgb(0, 0, 0); =
background-color: rgb(207, 207, 207); font-family: Menlo, Monaco, =
&quot;Courier New&quot;, monospace; font-size: 14px; line-height: 21px; =
white-space: pre;" class=3D""><div class=3D""><span style=3D"font-weight: =
bold;" class=3D"">\startMPcode{</span><span style=3D"color: #b07f00;" =
class=3D"">doublefun</span><span style=3D"font-weight: bold;" =
class=3D"">}</span> <span style=3D"color: #4f4f4f;font-weight: bold;" =
class=3D"">draw</span> lmt_contour <span style=3D"color: #00007f;" =
class=3D"">[</span></div><div class=3D"">xmin <span style=3D"color: =
#00007f;" class=3D"">=3D</span> <span style=3D"color: #007f7f;" =
class=3D"">0</span>, xmax <span style=3D"color: #00007f;" =
class=3D"">=3D</span> <span style=3D"color: #007f7f;" =
class=3D"">4</span><span style=3D"color: #7f7f00;" =
class=3D"">*</span><span style=3D"color: #007f00;font-weight: bold;" =
class=3D"">pi</span>, xstep <span style=3D"color: #00007f;" =
class=3D"">=3D</span> .<span style=3D"color: #007f7f;" =
class=3D"">05</span>,</div><div class=3D"">ymin <span style=3D"color: =
#00007f;" class=3D"">=3D</span> <span style=3D"color: #007f7f;" =
class=3D"">-6</span>, ymax <span style=3D"color: #00007f;" =
class=3D"">=3D</span> <span style=3D"color: #007f7f;" class=3D"">6</span>,=
 ystep <span style=3D"color: #00007f;" class=3D"">=3D</span> .<span =
style=3D"color: #007f7f;" class=3D"">05</span>,</div><div =
class=3D"">levels <span style=3D"color: #00007f;" class=3D"">=3D</span><sp=
an style=3D"color: #007f7f;" class=3D"">7</span>,</div><div =
class=3D"">height <span style=3D"color: #00007f;" class=3D"">=3D</span> =
<span style=3D"color: #007f7f;" class=3D"">5</span><span style=3D"color: =
#4f4f4f;font-weight: bold;" class=3D"">cm</span>,</div><div =
class=3D"">preamble <span style=3D"color: #00007f;" class=3D"">=3D</span> =
<span style=3D"color: #00007f;" class=3D"">"</span><span style=3D"color: =
#7f007f;" class=3D"">local sin, cos =3D math.sin, math.cos</span><span =
style=3D"color: #00007f;" class=3D"">"</span>,</div><div class=3D""><span =
style=3D"color: #007f00;font-weight: bold;" class=3D"">function</span> =
<span style=3D"color: #00007f;" class=3D"">=3D</span> <span =
style=3D"color: #00007f;" class=3D"">"</span><span style=3D"color: =
#7f007f;" class=3D"">cos(x) + cos(y)</span><span style=3D"color: =
#00007f;" class=3D"">"</span></div><div class=3D""><span style=3D"color: =
#4f4f4f;font-weight: bold;" class=3D"">background</span> <span =
style=3D"color: #00007f;" class=3D"">=3D</span> <span style=3D"color: =
#00007f;" class=3D"">"</span><span style=3D"color: #7f007f;" =
class=3D"">bitmap</span><span style=3D"color: #00007f;" =
class=3D"">"</span>,</div><div class=3D"">foreground <span style=3D"color:=
 #00007f;" class=3D"">=3D</span> <span style=3D"color: #00007f;" =
class=3D"">"</span><span style=3D"color: #7f007f;" =
class=3D"">edge</span><span style=3D"color: #00007f;" class=3D"">"</span>,=
 </div><div class=3D"">linewidth <span style=3D"color: #00007f;" =
class=3D"">=3D</span> <span style=3D"color: #007f7f;" =
class=3D"">1</span><span style=3D"color: #7f7f00;" =
class=3D"">/</span><span style=3D"color: #007f7f;" class=3D"">2</span>, =
</div><div class=3D"">cache <span style=3D"color: #00007f;" =
class=3D"">=3D</span> <span style=3D"color: #00007f;font-weight: bold;" =
class=3D"">true</span>,</div><div class=3D""><span style=3D"color: =
#00007f;" class=3D"">]</span>; </div><div class=3D""><span =
style=3D"font-weight: bold;" class=3D"">\stopMPcode</span></div><br =
class=3D""></div></div><div class=3D""><br class=3D""></div><div =
class=3D"">In the output, the background of text is gray while the =
background of text in the manual is white.</div><div class=3D"">Here are =
versions of LuaMetaTeX and ConTeXt which I use.</div><div class=3D""><br =
class=3D""></div><div class=3D"">%%%%%%%</div><div class=3D""><div =
class=3D"">This is LuaMetaTeX, Version 2.03.4&nbsp;</div><div =
class=3D"">open source &nbsp; &nbsp; &gt; level 1, order 1, name =
'cont-yes.mkiv'</div><div class=3D"">system &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;&gt;&nbsp;</div><div class=3D"">system &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;&gt; ConTeXt &nbsp;ver: 2019.12.16 18:54 MKIV beta &nbsp;fmt: =
2019.12.17 &nbsp;int: english/english</div><div class=3D"">system &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;&gt;&nbsp;</div></div><div =
class=3D"">%%%%%%%%%</div><div class=3D""><br class=3D""></div><div =
class=3D"">Is there anything that I miss?</div><div class=3D"">Would you =
please to check it?</div><div class=3D""><br class=3D""></div><div =
class=3D"">Thank you.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Best regards,</div><div class=3D""><br class=3D""></div><div =
class=3D"">Dalyoung</div></body></html>=

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