??? Error using ==> interp1 at 261 The values of X should be distinct. Error in ==> StallPower_20131029_S809 at 10 c=interp1(​rc_table(:​,2),rc_tab​le(:,3),ra​d);

When i'm using iterp1 with rc_table, displaying this message

??? Error using ==> interp1 at 261
The values of X should be distinct.

Error in ==> StallPower_20131029_S809 at 10
    c=interp1(rc_table(:,2),rc_table(:,3),rad);

What is the problem and its solution, Please?

rc_table :
1  1  0.345899000000000
2  1.50000000000000  0.712727000000000
3  2  0.661241000000000
4  2.50000000000000  0.609755000000000
5  3  0.560511000000000
6  3.50000000000000  0.511266000000000
7  4  0.459780000000000
8  4.50000000000000  0.408293000000000
9  5  0.356807000000000
10  5.50000000000000  0.308684000000000

[Walter Roberson]

Could you check size(rc_table,1) and length(unique(rc_table(:,2)))

Answer 1

[ES]

For your data it works fine. All it says is values in X must be distinct and monotonously increasing. Your X is

rc_table(:,2)

and its values are

     1.0000
      1.5000
      2.0000
      2.5000
      3.0000
      3.5000
      4.0000
      4.5000
      5.0000
      5.5000

which are unique and monotonically increasing. If I were you, I would check the data again and check if there is any accidental conversion to integer type.

for example, if you had done int8(rc) somewhere, then interpolation would fail.