Plot smoothing line without points

2023 1 2
1 个回答
回答已采纳
更新时间：2023 1 3
5 次查看（30 天）

0 个投票

Hey,
can i just plot the smoothing line without the scatter points? And is it possible to get just the Data of the smoothing line to plot more than one line in one figure?
Thank you!

1 个评论
显示 -1更早的评论 隐藏 -1更早的评论

Cameron
Cameron 2023-1-2
What do you mean by smoothing line? You can take the information from polyfit and use that if it's some polynomial fit, but I'm not sure what your model looks like. I'm also not sure what the second question means.

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
Star Strider 2023-1-2
Ran in:

1 个投票

Ran in:
I am not certain what you wnat to do.
Taking a guess —
N = 20;
x = sort(randn(1,N));
y = randn(1,N);
xs = linspace(min(x), max(x), 10*N);
ys = interp1(x, y, xs, 'spline'); % Interpolate Using 'spline'
figure
subplot(2,1,1)
plot(x, y, '.')
hold on
plot(xs, ys)
hold off
grid
axis('padded')
title('With Points')
subplot(2,1,2)
plot(xs, ys)
grid
axis('padded')
title('Without Points')
To plot more than one line in one axes, use the hold function. To plot more than one axes in one figure, use subplot, tiledlayout, or stackedplot, depending on what you want to do. (I have illustrated a version all those here.)
.

5 个评论
显示 3更早的评论 隐藏 3更早的评论

Max1234
Max1234 2023-1-3
Thank you very much for your efforts.
Your answer already goes in the right direction. I have several data sets that have a large number of measuring points. I would like to generate a trend line from all six data sets and display it in a diagram. In this diagram, only the trend lines and not the points should be visible. Unfortunately, with the Curve Fit Tool only one curve is possible at a time and the scatter points are visible.
I have tried your answer, but I always get errors. As X-values I have converted dates into numbers with datenum.
Thanks again for the help!
Max1234
Max1234 2023-1-3
Error using matlab.internal.math.interp1
Sample points must be unique.
Error in interp1 (line 188)
VqLite = matlab.internal.math.interp1(X,V,method,method,Xqcol);
Error in Skript02 (line 67)
ys1 = interp1(x,y,xs1,'spline');
This is the errormessage....
Star Strider
Star Strider 2023-1-3
Ran in:
Ran in:
My pleasure!
I was not certain what you meant by ‘smoothing line’.
To calculate a linear regression for all the points, the correct approach would be to use the polyfit and polyval functions —
N = 20;
x = randn(1,N);
y = randn(1,N);
xs = linspace(min(x), max(x), 10*N);
b = polyfit(x,y,1);
ys = polyval(b, xs);
figure
subplot(2,1,1)
plot(x, y, '.')
hold on
plot(xs, ys)
hold off
grid
axis('padded')
title('With Points')
subplot(2,1,2)
plot(xs, ys)
ylim([min(y) max(y)])
grid
% axis('padded')
title('Without Points')
The polyfit function can also fit polynomials of integer degrees greater than 1.
.
Max1234
Max1234 2023-1-3
Thank you very much! You helped me a lot!
Star Strider
Star Strider 2023-1-3
As always, my pleasure!

请先登录，再进行评论。

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 Smoothing 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