2012年11月6日 · Get the tangent by subtracting the two points (x2-x1, y2-y1). Normalize it and rotate by 90 degrees to get the normal vector (a,b) . Take the dot product with one of the points to get the constant, c .

2013年11月13日 · Given the equation y = m*x + b, where m is the slope and b is the y-intercept, you already have y, m, and x (just plug in X1, Y1), so you can solve for b. – Reinstate Monica -- notmaynard Commented Nov 13, 2013 at 17:18

2016年4月7日 · x2 and y2 are the same for the other line. import matplotlib.pyplot as plt x1, y1 = [-1, 12], [1, 4] x2, y2 = [1, 10], [3, 2] plt.plot(x1, y1, x2, y2, marker = 'o') plt.show() I suggest you spend some time reading / studying the basic tutorials found on the very rich matplotlib website to familiarize yourself with the library.

Question 530233: Given: m = (y2 - y1)/x2 - x1), y = mx + b, and the points (-2, 2) and (2, 4). Find the y-intercept. Write the equation of the line in slope-intercept form Answer by jim_thompson5910(35256) (Show Source):

2017年9月16日 · The compiler tells you that y1 is already defined. And as you define y1 on global scope you can conclude y1 is already defined on global scope. C does not allow redefining a symbol differently in the same scope it is already defined in. What C does allow is defining a symbol inside another scope.

warning for others, the question asks (x1, y1, x2, y2) while the answer provided is in (xmin, xmax, ymin, ymax), so please adapt accordingly – Joseph Adam Commented Mar 9, 2021 at 21:07

2021年9月3日 · Note that the terms (x2-x1) and (y2-y1) are squared (there should be a superscript 2 in the text), while you seem to be multiplying by 3. Not the same thing. Not the same thing. – njuffa

I suspect the problem is that when you open a smallish image, it has fewer pixels and fewer colours and is therefore more likely a palettised image rather than a full-colour RGB image - see here for explanation.

Imagine Python as running into the function call (calculateDistance(2, 4, 6, 8)), evaluating the function, and literally just replacing the line of code calculateDistance(2, 4, 6, 8) with the number that the function returns, let's say 7.

2021年4月27日 · TAN(theta) = Y2 - Y1 / X2 - X1. Rearranged to. ATAN(Y2-Y1/X2-X1) = theta. With the example points (16,16) and (16,6) the X2-X1 comes to zero and then the formula won't run due to the denominator being zero. ATAN2 solves problems with two Y coordinates being identical but I'm yet to find a solution for having two of the same X coordinate.