plotting plus minus 10% variation of a vector in matlab

Hi, I need some help with plotting. I have plotted two vectors A and B. Now I want to introduce a variation in vector A (10% variation dependent on some function, for simplicity, let's suppose linear), and plot on top of A as a shaded (continuous) error bar . How can I do such a plot in Matlab? (Something like attached picture, red line is actual data and blue is the variation in data). Many thanks for the help.

[Adam Danz]

No attachment.

This function from the file exchange is one of the go-to's for shaded errorbars

https://www.mathworks.com/matlabcentral/fileexchange/26311-raacampbell-shadederrorbar

The 10% variation can merely be added to your data (+/- 5%, most likely). For example, you could use the range function and multiply it by 5%, then use rand or randi to generate random numbers within that range and add/subtract them to/from the data.

[Sumera Yamin]

many thanks for pointing out this function. This is exactly what i was looking for.