Plotting a line given its slope and one coordinate

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Austin Britton 2019-12-13

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https://ww2.mathworks.cn/matlabcentral/answers/496411-plotting-a-line-given-its-slope-and-one-coordinate

编辑： Adam Danz 2019-12-13

I would like to plot a line given that its slope is roughly 1.08 and it passes through the point (88,56). I do not know the y-intercept and I would prefer not to calculate it as I have many lines for which I'd like to do this, each with their own intercept and slope.

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Adam Danz 2019-12-13

编辑：Adam Danz 2019-12-13

" I do not know the y-intercept and I would prefer not to calculate it"

You'll have to calculate something. One option is to plot a line segment in which case you'd need to use the slope to calculate a 2nd endpoint in addition to (88,56). Another option is to plot a line by calculate the y-intercept based on the slope and your known coordinate. The latter makes more sense.

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Answer 1

Star Strider 2019-12-13

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https://ww2.mathworks.cn/matlabcentral/answers/496411-plotting-a-line-given-its-slope-and-one-coordinate#answer_406190

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Try this:

x = 88;
y = 56;
slope = 1.08;
y_intercept = y - slope*x;
xv = [0 100];
figure
plot(xv, slope*xv+y_intercept, '-r')
hold on
plot(x, y, '+g', 'MarkerSize',15)
hold off
grid