Please what did i do wrong here..using interp2
1 view (last 30 days)
Show older comments
i was given a table of y\x and the given values of the corresponding temperatures, and i was told to find the estimate of the temperature at (1.2,0.7). i did my code but it did not seem to be right when i ran it .here is the code:
y=0.0:0.5:2.0;
x=0.0:0.5:2.5;
T= [0.00 5.00 10.00 15.00 20.00;
5.00 7.51 10.00 12.51 15.00;
10.00 10.05 10.00 9.95 10.00;
15.00 12.70 10.00 7.32 5.00;
20.00 15.67 10.00 4.33 0.00;
25.00 20.00 10.00 0.00 -5.00;];
Tn= interp2(x,y,T,1.2,0.7)
0 Comments
Answers (2)
Image Analyst
on 11 Apr 2015
All too common of a beginners mistake. You thought x,y = row,column. It's NOT. In other words, you swapped x and y. Remember the rows = y, not x like you had them, and the columns = x, not y like you had. So x,y = columns, rows, NOT rows, columns. Here is corrected code:
x=0.0:0.5:2.0;
y=0.0:0.5:2.5;
T= [0.00 5.00 10.00 15.00 20.00;
5.00 7.51 10.00 12.51 15.00;
10.00 10.05 10.00 9.95 10.00;
15.00 12.70 10.00 7.32 5.00;
20.00 15.67 10.00 4.33 0.00;
25.00 20.00 10.00 0.00 -5.00;];
whos y
whos x
size(T)
Tn= interp2(x,y,T,1.2,0.7)
5 Comments
Image Analyst
on 11 Apr 2015
They show a 5 row by 6 column table. You have a 6 row by 5 column table. And, no, semicolons are not required when writing out a table on multiple lines.
Star Strider
on 11 Apr 2015
@George — As I read Problem 2, you transposed the table. It’s supposed to be (5x6). Yours is (6x5). Transpose ‘T’ (use the (') transpose operator to avoid retyping it) and your code should work.
y=0.0:0.5:2.0;
x=0.0:0.5:2.5;
T= [0.00 5.00 10.00 15.00 20.00;
5.00 7.51 10.00 12.51 15.00;
10.00 10.05 10.00 9.95 10.00;
15.00 12.70 10.00 7.32 5.00;
20.00 15.67 10.00 4.33 0.00;
25.00 20.00 10.00 0.00 -5.00;];
T = T';
Tn= interp2(x,y,T,1.2,0.7)
produces:
Tn =
10.6660
0 Comments
See Also
Categories
Find more on Logical in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!