nrows = 4;

ncols = 6;

A = ones(nrows,ncols);

for c = 1:ncols

    for r = 1:nrows

        if r == c

            A(r,c) = 2;

        elseif abs(r-c) == 1

            A(r,c) = -1;

        else

            A(r,c) = 0;

        end

    end

end

A

A = 4×6

     2    -1     0     0     0     0

    -1     2    -1     0     0     0

     0    -1     2    -1     0     0

     0     0    -1     2    -1     0

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

确定值是否在指定范围内。

x = 10;

minVal = 2;

maxVal = 6;

if (x >= minVal) && (x <= maxVal)

    disp('Value within specified range.')

elseif (x > maxVal)

    disp('Value exceeds maximum value.')

else

    disp('Value is below minimum value.')

end

Value exceeds maximum value.