No data message in ModelSim

[grandslam47]

module barrel(W,Y,S);
    input [3:0] W;
    input [1:0] S;
    output [3:0]Y;
    wire [3:0]T;

    assign {T,Y}={W,W}>>S;
    
endmodule

module sim();
    reg  [3:0] W;
    reg [1:0] S;
    wire [3:0] Y ;

    barrel sim1(W, S, Y);
    initial begin
        W = 4'b0100;
        S = 2'b01;
    #10 S = 2'b10;
    #10 S = 2'b11;
    #10 S = 2'b01;

    #10 W = 4'b0110;              
        S = 2'b01;
    #10 W = 4'b0111;
        S = 2'b01;
    #10 W = 4'b1101;
        S = 2'b01;        
    end

endmodule

These are the two files I am using to try and generate the wave from; however, the "no data" message keeps popping up when I try to simulate the sim.v file. I have tried run-all and it returns some data, however, when I move it into the wave window it returns the message "No data". Any help would be greatly appreciated!

 

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The signals have to be in the waveform window before you run the simulation. Or you can use the line "log -r *" before you run the simulation.
e.g.

vsim my_sim
log -r *
run -all
add wave -r *

Only signals modelsim is logging will show up in the wave window after a simulation runs. You either use "add wave <my_signal>" for each signal or use the "log -r *" to log everything in the design before using the run command. Note the more signals in the wave window the slower your simulation will run.