MATLAB: Undefined operator ‘-‘ for input arguments of type ‘cell’

Question

 a1=intersectPts(i,1)
a2=xLine(i,2)
b1=intersectPts(i,2)
b2=yLine(i,2)
 euclideanDistance = sqrt((a1-a2)^2+(b1-b2)^2);

error: Undefined operator '-' for input arguments of type 'cell'

intersectPts is 11×2 double.

xLine and yLine are 11×2 cell.

How to solve this?

Answer 1

a1=intersectPts(i,1)
a2=xLine{i,2}
b1=intersectPts(i,2)
b2=yLine{i,2}
euclideanDistance = sqrt((a1-a2)^2+(b1-b2)^2);