八度图（）无法识别 fmt 字符串

Question

根据documentation for plot()，我应该可以通过格式参数来控制图形的样式。但是，Octave 似乎将其误解为不完整的属性规范，而不是格式字符串：

$ octave-cli
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1> t = linspace(0,5,1001);
2> plot(t, sin(pi*t), "g_;sin(πt)");
error: plot: properties must appear followed by a value
error: called from
    __plt__ at line 90 column 15
    plot at line 223 column 10

我是不是做错了什么或者这是一个错误？

Answer 1

正在按要求将我的评论转换为答案

来自文档：

The fmt format argument can also be used to control the plot style. It is a string composed of four optional parts: "<linestyle><marker><color><;displayname;>"

其中，有效的线型是：

‘-’     Use solid lines (default).
‘--’     Use dashed lines.
‘:’     Use dotted lines.
‘-.’     Use dash-dotted lines.

根据以上所述，格式字符串中有两个错别字。

首先是您使用 'underscore' (_) 而不是 'dash' (-) 作为线型说明符。

第二个是您没有按照语法要求 'enclose' 分号中的 "displayname"；你只放了左边的分号却忘记了右边的分号

所以正确的格式字符串应该是：

plot( t, sin( pi * t ), "g- ;sin(πt);" );

八度图（）无法识别 fmt 字符串

octave plot() not recognizing fmt string

octave