Error in execution?

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Masooma Tahir
Masooma Tahir 2016-11-6
编辑： VBBV 2021-11-12
clear
clc
x=[0 2 4 6 8];
y=[0 2 4 6 8];
T=[100 90 80 70 60; 85 64.49 53.50 48.15 50; 70 48.90 38.43 35.03 40; 55 38.78 30.39 27.07 30; 40 35 30 25 20];
x_target=4;
y_target=3.2;
*T_target=interp2(x,y.T,x_target,y_target)*
When I run this code it gives an error in the last line? Not sure why? Any help is much appreciated!
  1 个评论
Masooma Tahir
Masooma Tahir 2016-11-6
I tried the changes you said but still same error T_target=interp2(x,y,T,x_target,y_target)
Error in ex3 (line 12) T_target=interp2(x,y,T,x_target,y_target)

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回答（3 个）

Geoff Hayes
Geoff Hayes 2016-11-6
编辑：Geoff Hayes 2016-11-6
Masooma - you have a period separating the y and the T rather than a comma. Just change your last line to
T_target=interp2(x,y,T,x_target,y_target)
and try again!
  2 个评论
Masooma Tahir
Masooma Tahir 2016-11-6
I tried the changes you said but still same error T_target=interp2(x,y,T,x_target,y_target) Error in ex3 (line 12) T_target=interp2(x,y,T,x_target,y_target)
Geoff Hayes
Geoff Hayes 2016-11-6
If I run the code that you have posted and change from the period o the comma, then everything works fine without any errors. I suspect that you haven't posted all of your code or are doing something different without showing it. Please copy and paste the full error message into your question so that we can get an idea as to what the error is.

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Star Strider
Star Strider 2016-11-6
You need to use the griddata function, not interp2:
x=[0 2 4 6 8];
y=[0 2 4 6 8];
T=[100 90 80 70 60; 85 64.49 53.50 48.15 50; 70 48.90 38.43 35.03 40; 55 38.78 30.39 27.07 30; 40 35 30 25 20];
x_target=4;
y_target=3.2;
T_target=griddata(x,y,T,x_target,y_target)
T_target =
44.4580
figure(1)
surfc(x, y, T);
hold on
stem3(x_target, y_target, T_target, '^r', 'MarkerSize',10, 'MarkerFaceColor','r')
hold off
grid on
view([-130 25])
The interp2 function requires that your data be gridded before using the function. The griddata function creates the grid itself.
VBBV
VBBV 2021-11-12
编辑：VBBV 2021-11-12
Ran in:
clear
clc
x=[0 2 4 6 8];
y=[0 2 4 6 8];
T=[100 90 80 70 60; 85 64.49 53.50 48.15 50; 70 48.90 38.43 35.03 40; 55 38.78 30.39 27.07 30; 40 35 30 25 20];
x_target=4;
y_target=3.2;
T_target=interp2(x,y,T,x_target,y_target) % delete the . in interp2 and replace it with ,
T_target = 44.4580
Delete the dot. in the interp2 function

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