Accessing elements from 2d array using for loop

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Meenal Shah
Meenal Shah 2020-5-11
评论： Ameer Hamza 2020-5-11
I am using MATLAB for image processing
I have made gradmag as an outline of brain MRI scan and fgm4 is only the tumor region of the MRI.
Both are 2d arrays.
The following code, however, gives error:
G1 = zeros(200,200);
for i=1:200
for j=1:200
if((gradmag[i][j]>0) && fgm4[i][j]>0)
G1[i][j]=255;
end
end
end
figure
imshow(G1); title("Outline");
The error:
Error: File: test1.m Line: 106 Column: 20
Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check
for mismatched delimiters.
Line 106 refers to the if statement

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采纳的回答

Ameer Hamza
Ameer Hamza 2020-5-11
编辑：Ameer Hamza 2020-5-11
In MATLAB parenthesis are used for indexing, So change your code lines to
if((gradmag(i,j)>0) && fgm4(i,j)>0)
and
G1(i,j)=255;
Also read here: https://www.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.html
You can also take this course: https://www.mathworks.com/learn/tutorials/matlab-onramp.html to learn basics about MATLAB.

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