dear all
i run the following code :
clcclear allN=6; % number of disks
L=0.08; % the length of each segment
x = sym('x', [1 3*N], 'real');for i=1:N alf(i)=x(1,3*i-2); bet(i)=x(1,3*i-1); gam(i)=x(1,3*i); tet(i)=sqrt((alf(i))^2+(bet(i))^2); calf(i)=cos(alf(i)); salf(i)=sin(alf(i)); cbet(i)=cos(bet(i)); sbet(i)=sin(bet(i)); cgam(i)=cos(gam(i)); sgam(i)=sin(gam(i)); ctet(i)=cos(tet(i)); stet(i)=sin(tet(i)); vtet(i)=1-cos(tet(i));endplcl(:,1)=zeros(3,1); % rows for xyz position, cols for disk, 3rd dim for time
for i=1:N plcl(:,i+1)= L*[(bet(i)*vtet(i))/(tet(i)^2);-(alf(i)*vtet(i))/(tet(i)^2 );(stet(i))/tet(i)]; end
and i got this error :
The following error occurred converting from sym to double:DOUBLE cannot convert the input expression into a double array.If the input expression contains a symbolic variable, use VPA.Error in ENERJYplus1 (line 36) plcl(:,i+1)= L*[(bet(i)*vtet(i))/(tet(i)^2);-(alf(i)*vtet(i))/(tet(i)^2 );(stet(i))/tet(i)];
i really appreciated if someone help me that y i got this error and what s the solotion ?
and i should mention that i need to use diff for R at my next step
and i think i could use this code in past ver of matlab
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