# gnuplot

###### tags: `note`

reference:
* [測量執行時間](https://www.techiedelight.com/find-execution-time-c-program/)
* [clock_gettime](https://blog.gtwang.org/programming/measure-the-execution-time-in-c-language/2/)
* [其他方式](https://www.techiedelight.com/find-execution-time-c-program/)
* [List of performance analysis tools](https://en.wikipedia.org/wiki/List_of_performance_analysis_tools)
* [測量 cycle 數](https://blog.gtwang.org/programming/measure-the-execution-time-in-c-language/)
* [GCC 參數](http://gitqwerty777.github.io/gcc-usage/)
* [gnuplot](http://www.gnuplot.info/)
* [gnuplot 語法指令與解說](https://hackmd.io/@sysprog/Skwp-alOg?type=view) (看這個就差不多了)
* [gnuplot 語法解說(影片)](https://www.youtube.com/watch?v=kQ6SyQtxzWM&feature=youtu.be&ab_channel=jkrvivian)
* [基礎教學](https://blog.csdn.net/iemyxie/article/details/41548583)
* [gnuplot 點線種類](https://www.itread01.com/p/165343.html)

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* 要比較程式執行時間的話要先自己跑時間計算，並將結果存成一個 dataset
* gnuplot 再寫 script 去讀取 dataset 的資料

`script` 副檔名為 `.gp`

* 簡單指令
> $ gnuplot <`script.gp`> (繪圖)
> $ eog <`filename`> (看圖)

* 繪圖
* gnuplot 會依據程式碼的 **順序** 來繪圖