How do I write a while/loop function that will help me use a previous value to find the next value?

Question

originalsoccer16 2017-6-5

0
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https://ww2.mathworks.cn/matlabcentral/answers/343308-how-do-i-write-a-while-loop-function-that-will-help-me-use-a-previous-value-to-find-the-next-value

回答： Walter Roberson 2017-6-5

Hi, so I'm writing a matlab code that deals with acceleration, velocity, and distance formulas. I use the acceleration to find the velocity. The acceleration and velocity to find the distance.

I also use the initial velocity to find the next velocity and the initial distance to find the next distance. I use a for loop that deals with i. "i" is the angle used in the acceleration equation.

My code right now is very bad. I'm not very good at matlab but I'm trying so bare with me. Here is my current code:

clc
clear all
g=9.81;
uk=.15;
t=0.01;
V=0;
S=0;
a=0;
R=3;
theta=0;
V=0;
    while theta<90
        for i=0:90
            a(i)=g*cos(theta)-(uk*(g*sin(theta))+(V.^2/R));
            a=a(i);
            for i=0:90
                V(i)=V+a(i)*t;
                V=V(i);
                S(i)=S+(V*t.^2)+(.5*a(i)*t.^2);
                S=S(i);
                for i=0:90
                    theta(i)=S/R;
                    theta=theta(i);
                end
                end
            end
    end