[matlab] 2.Êý¾Ý¿ÉÊÓ»¯

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   <pre class="blockcode">t&#61;(0:0.01:2)*<span style="color:#000000;">pi;
x</span>&#61;<span style="color:#000000;">sin(t);
y</span>&#61;<span style="color:#000000;">cos(t);
z</span>&#61;cos(2*<span style="color:#000000;">t);
plot3(x,y,z,</span><span style="color:#800000;">&#39;</span><span style="color:#800000;">r-</span><span style="color:#800000;">&#39;</span>,<span style="color:#800000;">&#39;</span><span style="color:#800000;">linewidth</span><span style="color:#800000;">&#39;</span>,1.5<span style="color:#000000;">);
box on; </span>%<span style="color:#000000;">´ò¿ª×ø±êϵ±ß¿ò
legend(</span><span style="color:#800000;">&#39;</span><span style="color:#800000;">ÈýάÇúÏß×÷ͼ</span><span style="color:#800000;">&#39;</span>);</pre>
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   <pre class="blockcode">x&#61;0:0.2:1<span style="color:#000000;">;
y</span>&#61;<span style="color:#000000;">x;
[x y]</span>&#61;<span style="color:#000000;">meshgrid(x,y);
plot(x,y,</span><span style="color:#800000;">&#39;</span><span style="color:#800000;">b&#43;</span><span style="color:#800000;">&#39;</span><span style="color:#000000;">)
</span>%Õâ¾ÍÊÇËùÓÐ(x,y)µÄÈ¡Öµ ,È»ºó¼ÆËãËùÓеÄz&#61;f(x,y)¾Í¿ÉÒÔÁË</pre>
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  <span class="cnblogs_code_collapse">ÀûÓÃmeshgridÉú³ÉÍø¸ñ½Úµã</span>
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   <pre class="blockcode">dd&#61;0.001;n&#61;1&#43;1/<span style="color:#000000;">dd;
[x,y]</span>&#61;meshgrid(0:dd:1,0:dd:1<span style="color:#000000;">);
z</span>&#61;<span style="color:#000000;">0;
</span><span style="color:#0000ff;">for</span> j&#61;1<span style="color:#000000;">:n
    </span><span style="color:#0000ff;">for</span> i&#61;1<span style="color:#000000;">:n
        </span><span style="color:#0000ff;">if</span> x(i,j)&lt;sqrt(1-y(i,j).^2<span style="color:#000000;">)
            z(i,j)</span>&#61;x(i,j).^2&#43;y(i,j).^2<span style="color:#000000;">;
        </span><span style="color:#0000ff;">else</span><span style="color:#000000;">
            z(i,j)</span>&#61;<span style="color:#000000;">0;
        end
    end
end
surf(x,y,z);
shading flat;</span></pre>
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  <span class="cnblogs_code_collapse">z&#61;x^2&#43;y^2±»Ô²ÖùÃæx^2&#43;y^2&#61;1ÒÔ¼°Èý×ø±êƽÃæËù½ØµÃµÄÔÚµÚÒ»ØÔÏÞµÄͼÏñ</span>
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<p><a href="https://pan.baidu.com/s/1HUhgTi-cstetsKYTDhEgVw" title="¸½¼þ">¸½¼þÁ´½Ó</a>( ÃÜÂëju5z ) </p>
<p>ÏÂÔظ½¼þ a.csv ¸ø³öÁ˸߳ÌÊý¾Ý，¹²ÓÐ 2913 ÁÐ，2775 ÐÐ</p>
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   <pre class="blockcode">filename &#61; <span style="color:#800000;">&#39;</span><span style="color:#800000;">a.csv</span><span style="color:#800000;">&#39;</span><span style="color:#000000;">;
z </span>&#61;<span style="color:#000000;"> csvread(filename);
x0</span>&#61;1:1:2775<span style="color:#000000;">;
y0</span>&#61;1:1:2913<span style="color:#000000;">;
[xx0,yy0]</span>&#61;<span style="color:#000000;">meshgrid(x0,y0);
xx</span>&#61;xx0<span style="color:#800000;">&