problem with solve commans

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avner yakov 2017-6-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/345006-problem-with-solve-commans

评论： Adam 2017-6-16

i'm trying to model basketball shot, matlab showing me an error in the solve function.

clear all
clc
     theta=[pi/18:0.01:pi/2.01]; %%angles range
    l=7;     %%horizental distance
    h=1;     %%vertical distance
    Rb=0.1;  %%ball radius
    Rr=0.25; %%ring radius
    g=9.8;   %%gravity
    V=(l./cos(theta)).*sqrt(4.9./(l*tan(theta)-h)); %%speed as function of angle
    syms theta_o %%the edge angle who stiil enter the ring in the same velocity
    for i=1:numel(V)
        T(i)=(V(i)*sin(theta_o)+sqrt(V(i)^2*sin(theta_o)^2+2*9.8*h))/9.8; 
        x(i)=V(i)*cos(theta_o)*T(i);
        y(i)=V(i)*sin(theta_o)*T(i)-4.9*T(i)^2;
        square_s(i)=(x(i)-(l-Rr))^2+(y(i)-h)^2;
    end
    for i=1:numel(V)
        A(i)=solve(square_s(i)==Rb^2,theta_o);
        B(i)=solve(x(i)-l+Rb-Rr==0);
    end

someone can help?

this is the error message Error using subsasgn Subscripted assignment dimension mismatch.

Error in sym/privsubsasgn (line 997)
                L_tilde2 = builtin('subsasgn',L_tilde,struct('type','()','subs',{varargin}),R_tilde);
Error in sym/subsasgn (line 834)
            C = privsubsasgn(L,R,inds{:});