bode magnitude producing different plots for the same transfer function

1 次查看（过去 30 天）

显示更早的评论

jrz 2022-9-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1811740-bode-magnitude-producing-different-plots-for-the-same-transfer-function

评论： Star Strider 2022-9-25

采纳的回答： Star Strider

I have transfer function and have manually extracted the magnitude and plotted it. When I used the bodemag function however, the plot looks very different. Im confused as to which one is correct and why they are coming out differently, as I havent applied any unit conversions. For my manual extraction, I have used the following and its produced the plot underneath.

[mag phase] = bode(tf);

Mag = transpose(squeeze(mag));

However, when I use the bodemag(tf) function, I get this:

I dont understand why these reuslts are so different or which one is correct and am looking for some claririfcation.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Star Strider 2022-9-25

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1811740-bode-magnitude-producing-different-plots-for-the-same-transfer-function#answer_1060330

The upper plot is plotted with a linear magnitude and the lower one is plotted with the magnitude in decibels.

2 个评论
显示无隐藏无

Paul 2022-9-25

Also, the upper plot x-axis is linear and the lower is log scale. And they don't cover the same max and min values.

Star Strider 2022-9-25

Noted. I didn’t catch the frequency axis difference. I was concentrating on the magnitude axis.

请先登录，再进行评论。

更多回答（0 个）

请先登录，再回答此问题。

类别

MATLAB Graphics 2-D and 3-D Plots

在 Help Center 和 File Exchange 中查找有关 2-D and 3-D Plots 的更多信息

标签

Community Treasure Hunt

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

Translated by