how to get a case to over elements in matlab

There are two ways to use a "case" statement in MATLAB. One is to use the "switch" statement with the "case" keyword, and the other is to use a for loop with if-else statements.

To use "switch" statement with "case" keyword, follow the syntax below:

main.m
switch variable
    case value1
        % code block 1
    case value2
        % code block 2
    .
    .
    .
    case valueN
        % code block N
    otherwise
        % code block for other cases
end
206 chars
14 lines

Here, "variable" is the value to be checked against the various "case" conditions. If "variable" matches one of the case values (i.e., value1, value2, ..., or valueN), then the corresponding code block is executed. If none of the cases matches, then the "otherwise" code block is executed.

Alternatively, you can use a for loop with if-else statements to apply a case-like structure to a vector or matrix of elements. For example, the code below checks whether each element in "array" is less than, equal to, or greater than zero:

main.m
array = [-1, 0, 1, -2, 3];
for ii = 1:numel(array)
    if array(ii) < 0
        % code block 1
    elseif array(ii) == 0
        % code block 2
    else
        % code block 3
    end
end
188 chars
11 lines

In this case, the for loop iterates over each element in "array", and the if-else statements check the value of each element against the conditions in the code blocks. Note that vectorization can often be used to avoid the need for loops in MATLAB, which can make code faster and more concise.