Plotting a line of desired length starting from a particular point with slope given.

Question

Ron Herman 2020-11-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/650393-plotting-a-line-of-desired-length-starting-from-a-particular-point-with-slope-given

评论： Praveen Patnaik 2020-11-17

在 MATLAB Online 中打开

Any hints or suggestion will do.

I want to plot a line of desired length without that intersecting any axis.

Slope , length and starting point of line is given but no C (intercept is given). How do I plot it??

I was initially thinking of plotting a line of given length about orign and then shifiting it to different location.

please give your valuable feedback

For example we can plot an arc using parametric form about (0,0) and later shift it can this be done to a line???

r = 10;                     % arc length
aa = 60*pi/180;              % arc angle
ap = 0*pi/180;             % arc position angle
t1 = linspace(0,aa)-aa/2+ap;
[x1,y1] = pol2cart(t1,r); % arc data
% shifting arc to (10,20)
x1=x1+10
y1=y1+20
plot (x1,y1)

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Praveen Patnaik 2020-11-17

在 MATLAB Online 中打开

clc
clear
r = linspace(0,5);             % line segment lenth max is 5 and min is 0
theta = 60*pi/180;             % angle of inclination
% starting point
x0=2;
y0=4.4641;
                                
x1=x0+ r* cos(theta);
y1=y0+r * sin(theta);
% for highlighting point
ind= [25 75];
x1_h=x1(ind);
y1_h=y1(ind);
plot (x1,y1,x1_h,y1_h,'r+')

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Answer 1

KSSV 2020-11-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/650393-plotting-a-line-of-desired-length-starting-from-a-particular-point-with-slope-given#answer_546763

在 MATLAB Online 中打开

P0 = rand(1,2) ;  % initial point 
m = 1. ;   % slope 
% Equation of line  y-y1 = m*(x-x1) 
x1 = 1. ;   % some value 
y1 = P0(1)+m*(x1-P0(1)) ; 
P1 = [x1 y1] ;   % second point 
% 
v = P1-P0 ;
u = v/norm(v) ; 
% 
d = 6 ; % get a point at this distance 
P = P0+d*u ; 
% Check 
s = sqrt((P0(1)-P(1))^2+(P0(2)-P(2))^2) ; 
[s d]
% plot 
plot([P0(1) P1(1)],[P0(2) P1(2)])
hold on
plot(P(1),P(2),'*r')
 