Matlab

One dimensional linear interpolation

One dimensional interpolation command

%x: Raw data （ The independent variables ）n Dimension vector 
%v: Raw data （ Function value ）n Dimension vector 
%xq: interpolation （ The independent variables ） Can make a point , It can also be a vector 
%vq: Interpolation results （ Function value ）
vq = interp1(x,v,xq)
vq = intterp1(x,v,xq,method)

method Methods

2014a Version of matlab At present, there are several methods ：

give an example 1 — Interpolation method ：

The implementation script code is as follows ：

production = [75.995 ... .... ..] % Save here , In fact, it is the value of output 
years = 1900:10:2010;  % Set the year interval 
x = 1900:2010;
p_res = interp1(years,production,x,'spline')
plot(years,production,'o',x,p_res)

Running can get a continuous line .

give an example 2 — Interpolation method ：

The implementation script code is as follows ：

x = 0:2:24;
y = [....]   % Value of temperature 
%  Be careful ：x and y The dimensions should be the same , Form a one-to-one correspondence 
x1 = 0:1/3600:24   % In seconds , Increment of 1s

strmethod={
    'nearest',...}  % Method 
strlb={
    '{a}method=nearest',...}  % Corresponding to the method above 

for i=1:6
	y1 = interp1(x,y,x1,strmethod{
    i});
	subplot(3,2,i)    % Cut out 3*2 Pictures 
	plot(x,y,'ro',x1,y1,'b''linewith',1.5)
	xlabel(strlb)
end

The effect is as follows ：