Find intersection point given a line segment
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Hi I have the given image of a curve where the two points (blue crosses) are joint with a line and would like to know where this line would cross the x axis (see green line and point in blue circle).
Thanks in advance
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Star Strider
2017-11-18
Since it appears to be a linear regression, defined as:
y = slope * x + y_intercept;
the x-axis intercept (where y=0) would be:
x_intercept = -y_intercept / slope;
If you want to know where it intersects y=0.2,
x_intercept = (0.2 - y_intercept) / slope;
2 个评论
bram Vermeulen
2020-9-21
I don't understand this. I have a similar problem as OP but you will still need the y_intercept value to calculate x_intercept. How do you get this when you don't know y_intercept either.
Star Strider
2020-9-21
Both the slope and y-intercept are required. If you have the data, or at least two (x,y) points defining the line, you can calculate both the slope and y-intercept easily. The rest is straightforward.
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