Trial software Usage of Step Function in Matlab Coder?

Diego - 2020-12-08T10:40:50+00:00

Question: Trial software Usage of Step Function in Matlab Coder?

An excerpt of my code shown below:   % Creating the detector for the face detector = vision.CascadeObjectDetector; % Bounding Box for face A = step(detector,I); This basically doesn't work in the MATLAB coder as it says that A is undefined. The exact error is below: "Undefined function or variable 'A'. The first assignment to a local variable determines its class." If I use zeros and preallocate A, step just redefines it. Has anyone gotten around this?

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Expert Answer

Neeta Dsouza answered . 2025-11-20

Replace the assert statements with the following:

 

assert(isa(I, 'uint8'));
assert(size(I, 1) < 100);
assert(size(I, 2) < 100);
assert(size(I, 3) == 3);

function [rect] = bound(I)
  assert(isa(I, 'uint8'));
  assert(size(I, 1) < 100);
  assert(size(I, 2) < 100);
  assert(size(I, 3) == 3);
  detector = vision.CascadeObjectDetector;
  A = step(detector, I);
  rect = zeros(1,4);
  rect = [A(1,1), A(1,2), A(1,3), A(1,4)];
end

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