How does the indices inside select row change the input array

I am trying to understand the command "select row". I inserted in the indices of the select row block [5; 4; 3; 2; 1] which i thought that the output of this block will take the input and flip it based on the indices. for example if the input is [ 1 2 3 4 5] it will change to [5 4 3 2 1]. I used comma, semicolon and still the results did not make since to me. Please take a look and explain to me.

[Star Strider]

Reference — stats::selectRow

[Walter Roberson]

Please show an example of how you are calling it.

Star Strider suspects you are using stats::selectRow from the Symbolic Toolbox, but that function never changes the order of the rows and does not have a calling sequence that matches what you are describing.

I suspect that you are either using plain indexing or else that you are using a Simulink block.