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How do I fix this ?

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Eti Rastogi
Eti Rastogi on 28 Sep 2020
Closed: MATLAB Answer Bot on 20 Aug 2021
function pool_volume = A09_poolSubfunction_erastogi(surface_r, bottom_r, depth_shallow, depth_deep)
if (surface_r<0||bottom_r<0||depth_shallow<0||depth_deep<0) % calculation limitations
fprintf('Invalid input \n')
%calculating total volume of the pool
part_1= (2*pi*surface_r*depth_shallow);
part_2= (pi*(depth_deep-depth_shallow)*((surface_r)^2+(surface_r*bottom_r)+(bottom_r)^2)/3);
total_volume = (part_1+part_2)*7.48052; % total volume and conversion from feet^3 to gallons
fprintf(' The volume of the pool is % gallons \n',total_volume)
%Output argument "pool_volume" (and maybe others) not assigned during call to "A09_poolSubfunction_erastogi".
%this is an error im seeing while i run it
  1 Comment
per isakson
per isakson on 28 Sep 2020
Rename total_volume to pool_volume ;(

Answers (2)

madhan ravi
madhan ravi on 28 Sep 2020
function total_volume = A09_poolSubfunction_erastogi(surface_r, bottom_r, depth_shallow, depth_deep)

Steven Lord
Steven Lord on 28 Sep 2020
In addition to the output argument renaming others have suggested, as written you need to assign something to the output argument in the case where your function was called with invalid input. Otherwise you'll receive this same error in that case. Often NaN is used as an indicator that something went wrong.
Alternately I would probably throw an error (or maybe replace that if statement with four assert statements, if I wanted to throw more specific error messages like "surface_r must be nonnegative") instead of using fprintf and return.

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