Is there a function to plot a function with logarithmic scale like 'semilogy' does?

5 次查看（过去 30 天）
Shuangfeng Jiang
Shuangfeng Jiang 2020-7-16
评论： Walter Roberson 2020-7-16
I would like to plot a function, and it seems that there's only 'fplot' that can do it as what I've got is just a function rather than a set of data. However, I would like to plot the function with logarithmic scale without assigning a set of input to the function, and 'semilogy' doesn't work as I don't have the input data but the specified input interval.
%% a very simple example
syms x
y(x)=exp(x);
f1=matlabFunction(y)% how to plot the function with logarithmic scale without assigning a set of input?
Therefore, is there a function like a combination of 'fplot' and 'semilogy', which can help us plot the function with logarithmic scale without assigning a set of input to the function?

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2020-7-16
Note that you can use fplot with Symbolic expressions and functions... but using matlabFunction can result in faster execution.
Anyhow, fplot and then set the axes properties XScale or YScale to 'normal' or 'log'
  2 个评论
Shuangfeng Jiang
Shuangfeng Jiang 2020-7-16
Thanks for answering.
This is a good idea, but it doesn't seem working.
Personally this is because the range of y is not big enough. Do you think so?The curve wasn't plotted with logarithmic scale
Walter Roberson
Walter Roberson 2020-7-16
I can tell by the spacing that it is using log for the y axes. The 0.45 to 0.5 distance is about half of the 0.25 to 0.3 distance.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Title 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by