# Documentation

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## Plotting Distributed Data Using pmode

Because the workers running a job in pmode are MATLAB® sessions without displays, they cannot create plots or other graphic outputs on your desktop.

When working in pmode with codistributed arrays, one way to plot a codistributed array is to follow these basic steps:

1. Use the `gather` function to collect the entire array into the workspace of one worker.

2. Transfer the whole array from any worker to the MATLAB client with `pmode lab2client`.

3. Plot the data from the client workspace.

The following example illustrates this technique.

Create a 1-by-100 codistributed array of 0s. With four workers, each has a 1-by-25 segment of the whole array.

```P>> D = zeros(1,100,codistributor1d()) Lab 1: This lab stores D(1:25). Lab 2: This lab stores D(26:50). Lab 3: This lab stores D(51:75). Lab 4: This lab stores D(76:100).```

Use a `for`-loop over the distributed range to populate the array so that it contains a sine wave. Each worker does one-fourth of the array.

```P>> for i = drange(1:100) D(i) = sin(i*2*pi/100); end;```

Gather the array so that the whole array is contained in the workspace of worker 1.

`P>> P = gather(D, 1);`

Transfer the array from the workspace of worker 1 to the MATLAB client workspace, then plot the array from the client. Note that both commands are entered in the MATLAB (client) Command Window.

```pmode lab2client P 1 plot(P)```

This is not the only way to plot codistributed data. One alternative method, especially useful when running noninteractive communicating jobs, is to plot the data to a file, then view it from a later MATLAB session.