Index in position 1 is invalid. Array indices must be positive integers or logical values. getting this error command while running this code

old_obs_1 = plot3(Obs5(1,1), Obs5(1,2), Z(round(Obs5(1,2)),round(Obs5(1,1))),'o','MarkerSize',20, 'MarkerFaceColor','r','MarkerEdgeColor', 'k');

Please help

Thanks in advance

[Benjamin Thompson]

Please provide the definitions of Obs5 and Z.

[JIBIN GEORGE]

It is already defined while evaluating the code as a whole

Answer 1

[Simon Chan]

At least the value on Obs5(1,2) is <0.5

Obs5 = [0.5 0.4];
Z=rand(2,3);
old_obs_1 = plot3(Obs5(1,1), Obs5(1,2), Z(round(Obs5(1,2)),round(Obs5(1,1))),'o','MarkerSize',20, 'MarkerFaceColor','r','MarkerEdgeColor', 'k');

Index in position 1 is invalid. Array indices must be positive integers or logical values.

[JIBIN GEORGE]

Yes my previous defenition of the Obs5 = [125 0];

when it changed to Obs5 = [125 10];

works fine

Thank you

Answer 2

[KSSV]

This error is simple, you are trying to extract more number of elements than present in the array.

A = rand ;  % A is aconstat i.e 1x1 array. 
A(1)   % no error 

ans = 0.6042

A(1,2)  % error becasue there is no second element, alse A(2) means the same 

Index in position 2 exceeds array bounds. Index must not exceed 1.

Check your variable dimensions. You have used index 2, it seemsthere is no second element.