Use Data (
) to export numerical data to a file. Data export operates directly on data sets. You can use different types of evaluation points other than the ones in the data set (for example, a grid) and export the data in spreadsheet or sectionwise formats.
) to export numerical data to a file. Data export operates directly on data sets. You can use different types of evaluation points other than the ones in the data set (for example, a grid) and export the data in spreadsheet or sectionwise formats.To export data, you can right-click Export (
) and select Data (
), or right-click any data set node, for example, Solution, and select Add Data to Export. Click the Data node under Export.
) and select Data (), or right-click any data set node, for example, Solution, and select Add Data to Export. Click the Data node under Export.
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Enter a Filename including a path to save the data file to your computer or click Browse and navigate to where you want to Save the output. For example, navigate to the desktop and enter a Filename in the Export Data window. You can save the data using one of the following file types that you choose from the Save as type list: text files (*.txt), CSV (comma-separated values) files (*.csv), data files (*.dat), or unstructured VTK files (*.vtu).
Select the Always ask for filename check box if you want the program to always display a dialog box for specifying where to store the data.
Select the Points to evaluate in: Take from data set (the default), From file, Grid, or Regular grid. Depending on the selected type of points to evaluate in, various settings are available.
The default Take from data set uses the data points for the data in the data set. Select a Data format: Spreadsheet (the default) or Sectionwise. Spreadsheet data is useful to use the data in spreadsheet applications and sectionwise data format is useful for unstructured interpolation because it contains the exact mesh used to perform the interpolation.
For either choice, select a Space dimension: Take from data set (the default), Global, 0, 1, 2, or 3. Then select a Geometry level: Take from data set (the default), Volume, Surface, Line, or Point (availability is based on the model space dimension).
If Spreadsheet is selected (and if required), choose the Transpose check box to transpose the data from columns to rows.
If From file is selected, it uses coordinates from a data file. Then enter a Coordinate filename for a text file with the coordinates for the data output, or click Browse to locate the file.
If Grid or Regular grid is selected, it uses a grid to define the points to evaluate in. Select a Data format: Spreadsheet (the default) or Grid. Spreadsheet data is useful for using the data in spreadsheet applications, whereas the grid data format is more compact and can be useful to store data that can be imported into another model.
If Grid is selected as the Data format, also specify the x, y, and z coordinates for the grid points in the fields, or, for the Regular grid, specify the Number of x points, Number of y points, and Number of z points for the regular grid in the fields (default: 10 points in each direction).
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The Include header and Full precision check boxes are selected by default. Click to clear the check box if you do not want to include a header, or to limit the precision in the output to six significant figures (and which provides an output that contains all significant figures for data stored as double-precision numbers). When exporting to VTK files, the Include header check box is not available.
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By default the data is unsorted. Select the Sort check box to sort the data by increasing x, y, and z coordinates.
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From the If the file exists list, select Overwrite (the default) to replace the data in the file with the data you export, or choose Append to append the data to the end of the file. Appending data can be useful when exporting data for a parametric sweep, for example. When exporting to VTK files, the If the file exists list is not available.
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The Evaluate in list is only available for data from Solution data sets. From the Evaluate in list, select Lagrange points (the default) or Gauss points to specify where COMSOL Multiphysics evaluates the data — the nodes of the Lagrange elements or in the Gauss points for the Gaussian quadrature, respectively.
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Select a data Smoothing method — None, Inside material domains (the default, for smoothing within domains shared by the same material but not across material boundaries), Inside geometry domains (for smoothing within each geometry domain but not across interior boundaries), Everywhere, or Expression. If you choose Expression, enter an expression in the Expression field such that smoothing occurs where the expression is continuous. The default expression is dom, the domain variable, which is equivalent to the Internal smoothing. You can also — in a surface plot, for example — use material.domain, which is an indicator variable for domains that share the same material (see Material Group Indicator Variables) and is equivalent to the Inside material domains setting.
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Select a Resolution: Normal (default), Finer, Fine, or Custom. If Custom is selected, enter a Lagrange-element node-point order (the default is 1). Use a higher node-point order for a finer resolution.
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Select a recovery setting from the Recover list. The default is Off because recovery takes processing time. To use polynomial-preserving recovery and recover fields with derivatives such as stresses or fluxes with a higher theoretical convergence than smoothing, from the Recover list, select Within domains to perform recovery inside domains or Everywhere to apply recovery to all domain boundaries.
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Click the Export button (
) in the Settings window or right-click the node and select Export. The Messages window confirms where the files are exported as specified in the Output section.
) in the Settings window or right-click the node and select Export. The Messages window confirms where the files are exported as specified in the Output section.
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