Hellow there. I want to connect functions with different scopes, but it doesn’t work. Where did I go wrong? Have a nice day everyone
here is my code

clc; clear all; close all;

A = readmatrix(‘w10_data.xlsx’,’Sheet’,’Sheet1′);

x = A(:,1);
fx = A(:,2);

%1D linear interpolation
xspace = [];
px = [];
for i = 1:3
x_segment = linspace(x(i), x(i+1),101);
p_segment = fx(i) + (fx(i+1) – fx(i))/(x(i+1)-x(i))*(x_segment-x(i));
xspace = [xspace x_segment(1:end-1)];
px = [px p_segment(1:end-1)];
end

% Polynomial interpolation

xspace2 = 4:0.01:7;
Lx = zeros(1,length(xspace2));

for j = 1:size(x,1)
lj = 1;
for m = 1:size(x,1)
if m == j
continue
end

lj = lj .*(xspace2 -x(m))/((x(j)-x(m)));
end
Lx = Lx + fx(j)*lj;
end

% Cubic spline interpolation

xspace3 = 7:0.01:10;
S = spline(x(7:end),fx(7:end),xspace3);
%S = spline(x,fx,xspace2);

figure(1)
scatter(x,fx,’k’,’filled’); hold on;
plot(xspace,px,’b’); hold on;
plot(xspace2,Lx,’r’); hold on;
plot(xspace2,S,’g’); hold on;
xlim([0 12]);
ylim([0 20]);Hellow there. I want to connect functions with different scopes, but it doesn’t work. Where did I go wrong? Have a nice day everyone
here is my code

clc; clear all; close all;

A = readmatrix(‘w10_data.xlsx’,’Sheet’,’Sheet1′);

x = A(:,1);
fx = A(:,2);

%1D linear interpolation
xspace = [];
px = [];
for i = 1:3
x_segment = linspace(x(i), x(i+1),101);
p_segment = fx(i) + (fx(i+1) – fx(i))/(x(i+1)-x(i))*(x_segment-x(i));
xspace = [xspace x_segment(1:end-1)];
px = [px p_segment(1:end-1)];
end

% Polynomial interpolation

xspace2 = 4:0.01:7;
Lx = zeros(1,length(xspace2));

for j = 1:size(x,1)
lj = 1;
for m = 1:size(x,1)
if m == j
continue
end

lj = lj .*(xspace2 -x(m))/((x(j)-x(m)));
end
Lx = Lx + fx(j)*lj;
end

% Cubic spline interpolation

xspace3 = 7:0.01:10;
S = spline(x(7:end),fx(7:end),xspace3);
%S = spline(x,fx,xspace2);

figure(1)
scatter(x,fx,’k’,’filled’); hold on;
plot(xspace,px,’b’); hold on;
plot(xspace2,Lx,’r’); hold on;
plot(xspace2,S,’g’); hold on;
xlim([0 12]);
ylim([0 20]); Hellow there. I want to connect functions with different scopes, but it doesn’t work. Where did I go wrong? Have a nice day everyone
here is my code

clc; clear all; close all;

A = readmatrix(‘w10_data.xlsx’,’Sheet’,’Sheet1′);

x = A(:,1);
fx = A(:,2);

%1D linear interpolation
xspace = [];
px = [];
for i = 1:3
x_segment = linspace(x(i), x(i+1),101);
p_segment = fx(i) + (fx(i+1) – fx(i))/(x(i+1)-x(i))*(x_segment-x(i));
xspace = [xspace x_segment(1:end-1)];
px = [px p_segment(1:end-1)];
end

% Polynomial interpolation

xspace2 = 4:0.01:7;
Lx = zeros(1,length(xspace2));

for j = 1:size(x,1)
lj = 1;
for m = 1:size(x,1)
if m == j
continue
end

lj = lj .*(xspace2 -x(m))/((x(j)-x(m)));
end
Lx = Lx + fx(j)*lj;
end

% Cubic spline interpolation

xspace3 = 7:0.01:10;
S = spline(x(7:end),fx(7:end),xspace3);
%S = spline(x,fx,xspace2);

figure(1)
scatter(x,fx,’k’,’filled’); hold on;
plot(xspace,px,’b’); hold on;
plot(xspace2,Lx,’r’); hold on;
plot(xspace2,S,’g’); hold on;
xlim([0 12]);
ylim([0 20]); matlab code MATLAB Answers — New Questions

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