error due to function application

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When I run the following code it gives the error:
Error: File: image_processing_project.m Line: 55 Column: 1
Function definitions are not permitted in this context.
I think there must be something wrong with the way I've placed the functions in the following code:
M = imread('C:\Users\bostock_h\Documents\Images\130510_162.jpg');
M = int16(M);
x = 975; %dimensions of the image
y = 1010;
sum=0;
steps = 12; %the number of steps taken for the average
lowlimit = 40; %minimum value to pass
highlimit = 200; %maximum value to pass
movel = 10; %amount of pixels moved to the left after check
prog = 0;
pixelnum = (x - movel - 1)*y; %Total number of pixels in the image
%Main loop begin
for j = 1:y
for i1 = movel + 1:x
c = checkright (i1,j);
if c ~= 0
b = 1;
else
b = -1;
end
if c == 0
c = checkleft (i1,j);
end
if c == -1
if b == 1
M(j,i1-movel) = 1;
end
end
if c == 1
if b == 1
M(j,i1-movel) = 250;
end
end
if c == 1
if b == -1
M(j,i1+movel) = 250;
end
end
if c == -1
if b == -1
M(j,i1+movel) = 1;
end
end
prog = prog + 1;
percent = (prog / pixelnum) * 100
end
end
imagesc(M)
colormap(gray)
function c = checkright(i1,j)
x1 = 1;
y1 = 0;
c = checkhorizontal(i1,j,x1);
end
function c = checkleft(i1,j)
x1 = -1;
y1 = 0;
c = checkhorizontal(i1,j);
function c = checkhorizontal(i1,j,x1)
for n = 0:steps
sum = M(j, i1 + n*x1) + sum;
end
avg = sum / steps;
if avg < lowlimit
c = -1*x1;
end
if avg > highlimit
c = 1*x1;
end
end

Accepted Answer

Walter Roberson
Walter Roberson on 25 Jun 2013
The first line of your file named "image_processing_project.m" must be
function image_processing_project

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