## Documentation Center |

When you open a saved MuPAD^{®} notebook file, the notebook
displays the results (outputs), but the engine does not "remember"
them. For example, suppose you saved the notebook `myFile1.mn` in
your current folder and then opened it:

`nb = mupad('myFile1.mn');`

Suppose that `myFile1.mn` performs these computations.

Open that file and try to use the value `w` without
synchronizing the notebook with its engine. The variable `w` currently
has no assigned value.

To synchronize a MuPAD notebook with its engine, you must evaluate the notebook as follows:

Open the notebooks that you want to evaluate. Symbolic Math Toolbox™ cannot evaluate MuPAD notebooks without opening them.

Use

`evaluateMuPADNotebook`. Alternatively, you can evaluate the notebook by selecting**Notebook**>**Evaluate All**from the main menu of the MuPAD notebook.Perform your computations using data and results obtained from MuPAD notebooks.

Close the notebooks. This step is optional.

For example, evaluate the notebook `myFile1.mn` located
in your current folder:

evaluateMuPADNotebook(nb);

Now, you can use the data and results from that notebook in
your computations. For example, copy the variables `y` and `w` to
the MATLAB^{®} workspace:

y = getVar(nb,'y') w = getVar(nb,'w')

y = sin(x)/(sin(x)^2 + 1) w = sin(x)/(sin(x)^2 - sin(x) + 1)

You can evaluate several notebooks in a single call by passing
a vector of notebook handles to `evaluateMuPADNotebook`:

nb1 = mupad('myFile1.mn'); nb2 = mupad('myFile2.mn'); evaluateMuPADNotebook([nb1,nb2]);

Also, you can use `allMuPADNotebooks` that
returns handles to all currently open notebooks. For example, if you
want to evaluate the notebooks with the handles `nb1` and `nb2`,
and no other notebooks are currently open, then enter:

evaluateMuPADNotebook(allMuPADNotebooks);

If any calculation in a notebook throws an error, then `evaluateMuPADNotebook` stops.
The error messages appear in the MATLAB Command Window and in
the MuPAD notebook. When you evaluate several notebooks and one
of them throws an error, `evaluateMuPADNotebook` does
not proceed to the next notebook. It stops and displays an error message
immediately. If you want to skip calculations that cause errors and
evaluate all input regions that run without errors, use `'IgnoreErrors',true`:

`evaluateMuPADNotebook(allMuPADNotebooks,'IgnoreErrors',true);`

Was this topic helpful?