What is ind2sub
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This is the code where I had doubt on the syntax of ind2sub
%Parameters
A=0.01; %Wb is the unit of A
B=0.001; %H is the unit of Inductance
I =(0:1:2); %row!
theta=(0:1:45).'; %column!
T = - A .* I .* cosd(theta) + B .* I.^2 .* sind(2*theta);
surf(I, theta, T)
xlabel('I'); ylabel('theta'); zlabel('Torque')
[maxT, idx] = max(T(:));
[r,c] = ind2sub(size(T), idx);
best_theta = theta(r);
best_I = I(c);
fprintf('best torque is %g at theta = %g and I = %g\n', maxT, best_theta, best_I);
采纳的回答
Star Strider
2021-7-20
编辑：Walter Roberson
2021-7-23
MATLAB uses linear indexing for arrays, however many arrays are also referred to by subscripts into the rows, columns, and additional dimensions. The ind2sub function converts the linear indices into subscripts.
In this example:
[maxT, idx] = max(T(:));
[r,c] = ind2sub(size(T), idx);
the ind2sub call takes linear index ‘idx’ and converts it to the appropriate subscripts into matrix ‘T’. (It appears to be completely appropriate here.)
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