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Interpolate line data to grid matlab

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Reza Zh
Reza Zh 2024 年 4 月 3 日
編集済み: Star Strider 2024 年 4 月 3 日
How can I find the points (red circles) which an arbitrary line (blue line) intersects in a grid?

回答 (1 件)

Star Strider
Star Strider 2024 年 4 月 3 日
編集済み: Star Strider 2024 年 4 月 3 日
Use the interp1 function —
x = [0.0 5.0];
y = [1.0 3.8];
figure
plot(x, y)
grid
hold on
Ax = gca;
xtix = Ax.XTick % X-Tick Grid Line Locations
xtix = 1x6
0 1 2 3 4 5
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
yvals = interp1(x, y, xtix) % Interpolate
yvals = 1x6
1.0000 1.5600 2.1200 2.6800 3.2400 3.8000
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
scatter(xtix, yvals) % Plot Results
hold off
ylim([0 5])
Also, if you do not have the information that created the plot, you can get it from the plot —
GetLines = findobj(Ax, 'Type','Line');
xv = GetLines.XData
xv = 1x2
0 5
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
yv = GetLines.YData
yv = 1x2
1.0000 3.8000
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
yvals = interp1(xv, yv, xtix)
yvals = 1x6
1.0000 1.5600 2.1200 2.6800 3.2400 3.8000
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
EDIT — (3 Apr 2024 at 21:47)
Added the last part with ‘GetLines’ and following code.
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