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  39   <h1 class="title">利用浏览器地址栏对函数作图
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  44
  45     <li><a href="../tags/termux/index.html#">termux</a> </li>
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  47   </ul>
  48   <p>使用Android端<a href="../index.html#">uweb浏览器</a>。<br>
  49 Termux提供了方便的软件包管理系统，缺省的uWeb地址栏功能配置需用到作图软件gnuplot。</p>
  50 <h4 id="安装gnuplot">安装gnuplot</h4>
  51 <ul>
  52 <li>安装 <a href="../searchurl/plugins.html">uweb定制Termux应用</a></li>
  53 <li>Termux下运行以下命令：<br>
  54 apt update<br>
  55 apt upgrade<br>
  56 apt install gnuplot</li>
  57 </ul>
  58 <h4 id="地址栏功能配置">地址栏功能配置：</h4>
  59 <ul>
  60 <li>配置文件<a href=e:default.acmd>default.acmd</a>每行格式如下：<br>
  61 菜单名:mimeType:命令行</li>
  62 <li>命令行可包含参数%s，运行时自动用地址栏输入内容替换。</li>
  63 <li>如果浏览器窗口当前地址为本地url，则此目录同时作为命令行工作目录。</li>
  64 </ul>
  65 <h4 id="配置文件defaultacmd如下">配置文件default.acmd如下：</h4>
  66 <pre><code>命令:text/plain:%s
  67 函数作图:image/svg+xml:gnuplot -e 'set term svg;set output; plot %s'
  68 函数作图(3d):image/svg+xml:gnuplot -e 'set term svg;set output; splot %s'
  69 超级计算器:text/html:echo &quot;%s&quot;|bc -l -q
  70 </code></pre>
  71 <p>长按uweb浏览器底部工具条刷新按钮弹出地址栏功能选择，选择“函数作图”，地址栏内输入函数如sin(x)**5就可显示函数图案。</p>
  72 <h4 id="常见问题及诊断">常见问题及诊断</h4>
  73 <ul>
  74 <li>确保gnuplot正确安装，在Termux提示符下，敲入gnuplot,然后回车，保证出现&quot;gnuplot&gt;&quot;。</li>
  75 <li>确保gnuplot正常运行, 在Termux提示符下，执行下面命令：<br>
  76 <code>gnuplot -e 'set term svg;set output; plot x'</code><br>
  77 屏幕输出应该为正常的svg文件（类似html文本）。</li>
  78 <li>Termux应为uweb定制包，否则有一堆设定需要修改。</li>
  79 <li>超微浏览器下长按设置按钮，勾选“标准错误输出”。再次在地址栏执行画图操作，此时浏览器会显示出错信息。</li>
  80 <li>为保证地址栏输入函数符合gnuplot规范，首个测试函数建议为&quot;x&quot;，即整个地址栏内输入为&quot;x&quot;。</li>
  81 </ul>
  82
  83 </div>
  84 <p>Last Modified: 2 April 2024<br>
  85 add js function in README<br>
  86 <pre></pre>
  87 </p>
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