uweb/zh/gnuplot/index.html

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<title>利用浏览器地址栏对函数作图</title>
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<h1 class="title">利用浏览器地址栏对函数作图
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<li><a href="../tags/termux/index.html">termux</a> </li>
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<p>使用Android端<a>uweb浏览器</a><br>
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>
<h4 id="安装gnuplot">安装gnuplot</h4>
<ul>
<li>安装 <a href="../searchurl/plugins.html">uweb定制Termux应用</a></li>
<li>Termux下运行以下命令<br>
apt update<br>
apt upgrade<br>
apt install gnuplot</li>
</ul>
<h4 id="地址栏功能配置">地址栏功能配置:</h4>
<ul>
<li>配置文件<a href=e:default.acmd>default.acmd</a>每行格式如下:<br>
菜单名:mimeType:命令行</li>
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<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>
<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>
</ul>
<h4 id="配置文件defaultacmd如下">配置文件default.acmd如下</h4>
<pre><code>命令:text/plain:%s
函数作图:image/svg+xml:gnuplot -e 'set term svg;set output; plot %s'
函数作图(3d):image/svg+xml:gnuplot -e 'set term svg;set output; splot %s'
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超级计算器:text/html:echo &quot;%s&quot;|bc -l -q
</code></pre>
<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>
<h4 id="常见问题及诊断">常见问题及诊断</h4>
<ul>
<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>
<li>确保gnuplot正常运行, 在Termux提示符下执行下面命令<br>
<code>gnuplot -e 'set term svg;set output; plot x'</code><br>
屏幕输出应该为正常的svg文件类似html文本</li>
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<li>Termux应为uweb定制包否则有一堆设定需要修改。</li>
<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>
<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>
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</ul>
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<p>Last Modified: 24 September 2022<br>
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remove /sdcard/uweb folder<br>
<pre></pre>
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