Error while converting polyshape into double

i have building my polyshape of a ship and i'm trying to rotate it depends on "head" value, which is the angle of the ship in radian.

in simple script it rotate absolutely fine, but in main script it find some error because the polyshape cannot convert into double data.

here i attached all my relevant script, the main script is "Kedua_LoopScript.m"

wonder why it cannot works and how to solve it

Answer 1

[Matt J]

You have pre-allocated ShipImg as a numeric double float vector,

ShipImg = ones(1,length(t)); %a double vector of ones

Then instead of trying to insert a number into ShipImg(n) in line 208, you try to assign a polyshape,

ShipImg(n) = ShipImgRotation(rad2deg(head(n)),LPP,B,xG); %right hand side is a polyshape, left side is not

You cannot stick a polyshape object into a memory location reserved for a double float.

[Matt J]

One way to preallocate a vector of polyshapes is,

clear ShipImg
ShipImg(5,1)=polyshape; %pre-allocate

ShipImg(1)=nsidedpoly(4) %assign to the first element in the polyshape vector

ShipImg = 
  5×1 polyshape array with properties:

    Vertices
    NumRegions
    NumHoles