how to multiply a curve (in a plot) by -1, if you do not have the original data? (I only have the plotted data.)

Hey there!

I have a fig file, and I have multiple curves in it. I would like to obtain the exact curves, above the x-axis, in positive sense. I lost the original data, and I would like to multiply my data which are below the x-axis by "-1". If I had the original data, it would be quiet easy. However, its close to impossible for me to find out the orginal data. Any help would be more than appreciated. ((I only have the plotted data.))

Answer 1

[Bruno Luong]

Plot your figure, you can then retrieve the data with

x = get(findobj(gcf,'Type','line'), 'xdata')
y = get(findobj(gcf,'Type','line'), 'ydata')

[Zeynep Ertekin]

Would x and y look like matrix or vector? Can I multiply by them -1 ?

[Bruno Luong]

"Would x and y look like matrix or vector?"

Why not try it and figure it yourself?

[Zeynep Ertekin]

can not acess matlab right now :( thanks for the answer!

Answer 2

[KSSV]

https://in.mathworks.com/matlabcentral/answers/383567-how-to-extract-x-y-data-values-from-matlab-figure

https://in.mathworks.com/matlabcentral/answers/100687-how-do-i-extract-data-from-matlab-figures