The whole point of excel is that it is a dynanmic spreadsheet. Changing data is easy and directly changes the plot as needed. I've never used gnuplot, but I have done my share of matlab. matlab is great for matricies, but is barely satisfactory for graphs.
I spent a couple hours the last two days working on a paper/ field report regarding soil consolidation data, which involved 10 load increments and 8 samples (at least 10 series on 8 plots, plus many more). Excel worked great for all the plots, espeically the semilog plots. I'd hate to have to input and change that amount of data in finicky matlab.
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