Calculate perimeter of a shape using x,y coordinates input to an array

How can I find the perimeter of a shape using x,y coordinates input to an array. The code below adds up the number of sides of the shape instead of the length of the sides which is what I need. The equation for calculating the distance between each pair of x,y points is: sqrt((dataX(i)+1)-dataX(i))^2+((dataY(i)+1)-dataY(i))^2

Many thanks

numberOfCoordinates=input('Please input the number of coordinates:');
    for i=1:1:numberOfCoordinates
        dataX(i)=input('Please enter the X co-ordinate:')       
        dataY(i)=input('Please enter the Y co-ordinate:')
        end
end
perimeter=0;
for i=1:1:numberOfCoordinates
      x=((dataX(i)+1)-dataX(i))^2
      y=((dataY(i)+1)-dataY(i))^2
	answer=sqrt(sum(x,y))
	perimeter=perimeter+answer
end

Answer 1

[Matt J]

pgon=polyshape(dataX,dataY);

perimeter(pgon)

[LR]

Thanks. However, I'm now getting the following message:

Unable to use a value of type polyshape as an index.

Error in filename (line 37) - perimeter(pgon)

perimeter(pgon)

[Matt J]

You must clear the variable called perimeter (the one you've created with your previous code) from the workspace.

[LR]

Sorry, I should have said when I asked I need to use the formula given to calculate the perimeter using a For loop. I'm trying to work out how to add the first coodinates again as the last coordinates, to create a complete shape. Any help would be appreciated.

Thank you

[Matt J]

You could just do

dataX(end+1)=dataX(1)

and similarly for dataY.

[LR]

How would I add that to my current code?

Thanks