After a little bit of digging, I managed to find a solution as follows:
Load the Filter Design and Analysis tool by typingfdatool into the command window
Design your filter
Click'Full View Analysis' (White Square Icon)
Click'Edit Plot' (Mouse Pointer Icon)
Click on the dataset you would like to capture
Return to the command window and enter:
x=get(gco,'xdata').';
y=get(gco,'ydata').';
The values used to plot the magnitude response in the FDATool are now stored in two vectors, x and y, these were transposed into columns to make them more manageable. Then simply open the vectors from the workspace, hit'Ctrl + A' to select all and paste into Excel, or export the data as required:https://uk.mathworks.com/help/stats/export-dataset-arrays.html
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