trying to plot the function for the double differentiation of a function on octave with no luck. I am trying to plot the double derivative of sin(x) in this case.
I know how to find the derivative of sin(x) on octave
x1 = linspace(-2*pi, 2* pi);
y1 = [NaN, diff(sin(x1))];
plot(x1,y1,'r-')
how can I similarly plot the graph for double differentiation of sin(x1)?
what I have tried so far:
x1 = linspace(-2pi, 2 pi);
y1 = [NaN, (diff(sin(x1),2))];
length(x1)
length(y1)
plot(x1,y1,'r-')
The length of x1 and y1 is different, but usually including NaN solved it for single differentiation. I can't get it right for double differentiation however.
ERROR:
>> tig
ans = 100
ans = 99
error: __plt2vv__: vector lengths must match
error: called from
__plt__>__plt2vv__ at line 487 column 5
__plt__>__plt2__ at line 247 column 14
__plt__ at line 112 column 18
plot at line 229 column 10
tig at line 5 column 1
PS: Also, I haven't learnt Octave officially and I have just took a short course on Youtube, would appreciate if someone gave me links for learning it through videos and pdfs
The command would be
x1 = linspace(-2*pi, 2* pi);
y1 = [NaN, (diff(sin(x1),2)), NaN];
length(x1)
length(y1)
plot(x1,y1,'r-')
Since we are double differentiating, we would have two vacancies, so we have to insert two NaN s
Source: comments on https://stackoverflow.com/a/71573275/18501521