Finding the slope of line

I have to find slope of best line (acceleration). How can I find it ? I couldn't find any datas about it on the internet.

[Stephen23]

"How can I find it ?"

By the definition of slope: the change in Y divided by the change in X.

Answer 1

[KSSV]

If you have points: use slope formula:

m = (y2-y1)/(x2-x1) ;

Or, fit a straight line using polyfit

p = polyfit(x,y,1) ;

In the above p will be a 2x1 matrix, which gives slope and y intercept.

Or, if you have image and want coordinates from there slope use:

https://in.mathworks.com/matlabcentral/fileexchange/7173-grabit

[madhan ravi]

+1

[Atique Barudgar]

Sir, how to find slope of data by polyfit, if in my data there is NaN values or empty values(no values).

Pls help by replying.

Shukriya.

[Navodita Das]

p = polyfit(x,y,1) ; using this I am getting a warning:

Warning: Polynomial is not unique; degree >= number of data points.

> In polyfit (line 74)

In pro2 (line 256)

How to rectify it?

where,

x=0.2653

y=0.0336

[KSSV]

Just for one point (x,y) you cannot use polyfit. Atleast you need two points to fit a straight-line.

[Navodita Das]

Ok,I got it. Thank you for helping.

[Syed Zubair shah]

can you share a short code for implementation? of polyfit(x,y,1)