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<div class="moz-cite-prefix">Le 20/10/2012 17:42,
<a class="moz-txt-link-abbreviated" href="mailto:Ercan.Ulupinar@web.de">Ercan.Ulupinar@web.de</a> a écrit :<br>
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<blockquote cite="mid:A54D7B36767F43C4B9D350DEAE54983C@UliMac"
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<div style="FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE:
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<div>Hi,</div>
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<div>how can i plot(3d) these inequations? :</div>
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<div>x^2 + y^2 <= 1 && 0 <= z <= x^2 +y^2 </div>
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</blockquote>
x^2 + y^2 <= 1 : is the filled cylinder along (Oz), of radius r=1<br>
<br>
let's set r^2 = x^2+y^2<br>
then zp(r) = x^2 +y^2 = r^2 is the vertical paraboloid with
minimum at (0,0)<br>
So 0 <= z <= zp(r) is the filled paraboloid bowl based on the
(Oxy) plane.<br>
The first condition limits the bowl within the cylindrical 0<= r
<= 1 part.<br>
<br>
Then using plot3d() becomes easy ;)<br>
<br>
Samuel<br>
<br>
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