Question

在matlab作出的图中，如何显示某参数的数据？

我用Matlab写了一个函数，读取一个文件里的数据，用polyfit将其拟合曲线，再plot出来。

现在的难题：我打算把拟合曲线时得到的参数直接标示在图中，这样我在读取不同的文件时，可以实时在图中显示参数。我想问一下该如何做才能实现！
不用把help发上来，这个我已经看过了，貌似仅这一点解决不了问题。
我举个例子吧：
ax=polyfit(tem,hbf,1);
x=30:2:70;
yh=ax(1)*x+ax(2);
plot(tem,hbf,'*k',x,yh,-k');
看上面的例子，我想把ax(1)和ax(2)的数据直接显示在图上（或者说 直线yh的函数形式如何直接显示在图上），具体该怎么做。

Answer 1

freqz();
里面的参数不一定,
一般是freqz(cos(t),t);
它会画出两个两,上图上幅频特性,下图是相频特性

如果对您有帮助，请记得采纳为满意答案，谢谢！祝您生活愉快！

Answer 2

>> help text
TEXT Text annotation.
TEXT(X,Y,'string') adds the text in the quotes to location (X,Y)
on the current axes, where (X,Y) is in units from the current
plot. If X and Y are vectors, TEXT writes the text at all locations
given. If 'string' is an array the same number of rows as the
length of X and Y, TEXT marks each point with the corresponding row
of the 'string' array.

TEXT(X,Y,Z,'string') adds text in 3-D coordinates.

TEXT returns a column vector of handles to TEXT objects, one
handle per text object. TEXT objects are children of AXES objects.

The X,Y pair (X,Y,Z triple for 3-D) can be followed by
parameter/value pairs to specify additional properties of the text.
The X,Y pair (X,Y,Z triple for 3-D) can be omitted entirely, and
all properties specified using parameter/value pairs.

Execute GET(H), where H is a text handle, to see a list of text
object properties and their current values. Execute SET(H) to see a
list of text object properties and legal property values.

See also xlabel, ylabel, zlabel, title, gtext, line, patch.

Reference page in Help browser
doc text

Answer 3

ax=polyfit(tem,hbf,1);
x=30:2:70;
yh=ax(1)*x+ax(2);
plot(tem,hbf,'*k',x,yh,-k');

%add one “32,5,”显示坐标自己调整

text(32,5, num2str(x))