smooth line in plot

hi,

I have a plot which contains 6 points. Now i want to smooth the line. How can I do that?

a = 0	1.56809885737654	1.00861433623079
1	0.477810012662993	0.172723989683935
2	0.307057557611696	0.0369907704137005
3	0.301187535069457	0.0712463310209048
4	0.250962057090148	0.0847637163609592
5	0.208201848906565	0.0233647321748921

Answer 1

[Star Strider]

a = [0	1.56809885737654	1.00861433623079
     1	0.477810012662993	0.172723989683935
     2	0.307057557611696	0.0369907704137005
     3	0.301187535069457	0.0712463310209048
     4	0.250962057090148	0.0847637163609592
     5	0.208201848906565	0.0233647321748921];


ai = linspace(min(a(:,1)),max(a(:,1)));
a1 = interp1(a(:,1), a(:,2:end), ai, 'pchip');

figure
plot3(a(:,1), a(:,2), a(:,3), 'p')
hold on
plot3(ai, a1(:,1), a1(:,2), '-r')
hold off
grid on

figure
plot(a(:,2), a(:,3), 'p')
hold on
plot(a1(:,1), a1(:,2), '-r')
hold off
grid
axis('equal')

ai = linspace(max(a(:,2)),min(a(:,2)));
a2 = interp1(a(:,2), a(:,3), ai, 'makima');

figure
plot(a(:,2), a(:,3), 'p')
hold on
plot(ai, a2, '-r')
hold off
grid
axis('equal')

.

[Dion Theunissen]

Unfortunately this is not correct. a(:,1) is my x axis, a(:,2) is my y axis. So the line has to go till atleast 5 on the x axis

[Star Strider]

In that instance, just use the first part of my Answer, that being (with a few tweaks) —

a = [0	1.56809885737654	1.00861433623079
     1	0.477810012662993	0.172723989683935
     2	0.307057557611696	0.0369907704137005
     3	0.301187535069457	0.0712463310209048
     4	0.250962057090148	0.0847637163609592
     5	0.208201848906565	0.0233647321748921];

ai = linspace(min(a(:,1)),max(a(:,1)));
a1 = interp1(a(:,1), a(:,2:end), ai, 'makima');

figure
plot3(a(:,1), a(:,2), a(:,3), 'p')
hold on
plot3(ai, a1(:,1), a1(:,2), '-r')
hold off
grid on
xlabel('X')
ylabel('Y')
zlabel('Z')
axis('equal')

.