How can i smooth my contour map?

Hi,

I have a set of datas and you can see them at code box. I should smooth my curves on map, but i am not be able to do it. How can i achieve this problem?

clear all
clc
rpm=[800	900	1000	1100	1200	1300	1400	1500	1600	1700	1800	1900	2000	2100	2200	2300	2400	2500]
pwr=[0.001	25	50	75	100	125	150	155	163]
con=[1000	240	220	218	NaN	NaN	NaN	NaN	NaN
1000	250	221	216	217	NaN	NaN	NaN	NaN
1000	260	222	214	214	NaN	NaN	NaN	NaN
1000	265	224	214	213	213	NaN	NaN	NaN
1000	275	226	214	211	211	NaN	NaN	NaN
1000	285	230	216	211	210	210	NaN	NaN
1000	295	235	218	212	210	210	NaN	NaN
1000	300	239	221	214	210	210	NaN	NaN
1000	308	245	225	216	212	210	NaN	NaN
1000	316	249	229	219	214	210	211	NaN
1000	332	260	235	223	217	214	214	NaN
1000	350	266	240	228	221	217	216	NaN
1000	364	279	247	234	225	222	219	224
1000	386	293	257	240	230	228	227	226
1000	390	325	275	250	238	239	236	236
1000	395	350	295	270	250	240	238	NaN
1000	400	360	325	290	NaN	NaN	NaN	NaN
1000	600	400	NaN	NaN	NaN	NaN	NaN	NaN]
z=1:18
o=1:9
ss=50
rpm_new=interp1(z,rpm,linspace(1,18,ss))
pwr_new=interp1(o,pwr,linspace(1,9,ss))


for k=1:ss
for p=1:ss
con_new(k,p)=interp2(pwr,rpm,con,pwr_new(p),rpm_new(k))
end
end
%contourf(rpm,pwr,con')
contourf(rpm_new,pwr_new,con_new')

[John D'Errico]

please don't delete your questions. This insults the person who answered it. This damages answers because it makes your question of no value to anyone else who wants to learn from your problem and solution. And it wastes the time of the person who made the effort to answer your question.

[Rena Berman]

(Answers Dev) Restored edit

[Bjorn Gustavsson]

Why do you want to "should smooth"? Contour map as it is looks perfectly reasonable and reflects the data that you have. If you want smooth contours you should get yourself smooth data or give some reason as to why you cannot live with the data you have. Your plots indicate nothing in way of noise that one could reasonably argue should be suppressed...

Answer 1

[Bjorn Gustavsson]

Have a look at these file-exchange contributions:

contour-line-smoothing, Smoothing 2D-Contours Using Local Regression Lines. There were a batch of other contributions that showed up when searching for "smooth contour", so if neither of those two works for you look

at the others...

HTH