how to create a matrix from another one, using for loop

--- I can't find what really causes the error in this function---

function Ant_Simpl_Mat = r_dnaOnMatrix(mat)

[x,y] = size(mat);

Ant_Simpl_Mat = reshape(blanks(x*y),x,y);

for i=1:x

for j=1:y

if mat(i,j)=='A'

Ant_Simpl_Mat(i,j)='T';

elseif mat(i,j)=='C'

Ant_Simpl_Mat(i,j)='G';

elseif mat(i,j)=='T'

Ant_Simpl_Mat(i,j)='A';

elseif mat(i,j)=='G'

Ant_Simpl_Mat(i,j)='C';

end

end

end

disp(Ant_Simpl_Mat)

end

Answer 1

[Star Strider]

I do not get an error when I run it.

A simpler approach (that avoids the nested loops and the if block):

Ai = mat == 'A';                                        % Logical Index
Ci = mat == 'C';                                        % Logical Index
Ti = mat == 'T';                                        % Logical Index
Gi = mat == 'G';                                        % Logical Index

Ant_Simpl_Mat = zeros(size(mat));                       % Preallocate Output Matrix
Ant_Simpl_Mat(Ai) = 'T';                                % Substitute
Ant_Simpl_Mat(Ci) = 'G';                                % Substitute
Ant_Simpl_Mat(Ti) = 'A';                                % Substitute
Ant_Simpl_Mat(Gi) = 'C';                                % Substitute
Ant_Simpl_Mat = char(Ant_Simpl_Mat)                     % Convert To ‘char’

It produces the same result as your code with my test matrix, so I assume both are correct.