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Yana Muhamadinah

Yana Muhamadinah (view profile)

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how can i calculate the angle of each gradient and x axis?

Asked by Yana Muhamadinah

Yana Muhamadinah (view profile)

on 26 Jul 2019
Latest activity Commented on by Yana Muhamadinah

Yana Muhamadinah (view profile)

on 1 Aug 2019
i have a line, its a sigmoid function. the code is like this
x = 0:0.1:10;
y = sigmf(x,[2 4]);
plot(x,y)
xlabel('sigmf, P = [2 4]')
ylim([-0.05 1.05])
i want to know every angle between each pair of point and the x axis. i mean for line y of x=0 and x=0.1, the angle is..
for line y of x=0.1 and x=0.2 the angle is...
how can i calculate that? thank you before!

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David Wilson

David Wilson (view profile)

Answer by David Wilson

David Wilson (view profile)

on 26 Jul 2019
Edited by David Wilson

David Wilson (view profile)

on 26 Jul 2019

You could always differentiate to get the slope and then take the arc-tan.
syms x real
s = 1/(1 + exp(-2*(x-4)))
dsdx = diff(s,x) % lazy way to get derivative
slope = matlabFunction(dsdx)
x = [0:0.1:10]';
y = sigmf(x,[2 4]);
Angle = atan2d(slope(x),1) % note degrees
subplot(2,1,1);
plot(x,y,'o-')
subplot(2,1,2);
plot(x, Angle); ylabel('angle [deg]')
test.png

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