How do I fix this error? Not enough input arguments.

Im running this function:

function value = a_p(e)

%analysing power

a2 = [ ];

b2 = [ ];

%find value closest to randomly selected energy, e

[~,I] = min(abs(a2-e));

c2 = a2(I);

%find corresponding analysing power to that energy value

idx = find(a2 == c2);

bidx = b2(idx);

a_p = b2(idx);

value = a_p;

end

where a2 and b2 is just an array of data, I keep recieving the same error:

Not enough input arguments

Error in a_p (line 7)

[~,I] = min(abs(a2-e));

Answer 1

[Star Strider]

Your ‘a_p’ function has no idea what ‘a2’ and ‘b2’ are because you have not shared those with them.

Try this:

function value = a_p(e,a2,b2)
%analysing power
%find value closest to randomly selected energy, e
 [~,I] = min(abs(a2-e));
 c2 = a2(I);
%find corresponding analysing power to that energy value
  idx = find(a2 == c2);
  bidx = b2(idx);
  a_p = b2(idx);
  value = a_p;
end

Change your calls to ‘a_p’ to include the extra arguments. Note that your find call requires that ‘a2’ exactly equals ‘c2’, and with integers that may work. However with floating-point operations that may not be true, even if they appear to be equal in the format you are viewing them.

[James Bagnall]

Ive changed it to the code below to include the values for a2 and b2 and I am still getting the same error:

Not enough input arguments.

Error in a_p (line 7)

[~,I] = min(abs(a2-e));

function value = a_p(e)

%analysing power

a2 = [4.00545E-13 8.0109E-13 1.20164E-12 1.60218E-12 2.00273E-12 2.40327E-12 2.80382E-12 3.20436E-12 3.60491E-12 4.00545E-12 4.406E-12 4.80654E-12 5.20709E-12 5.60763E-12 6.00818E-12 6.40872E-12 6.80927E-12 7.20981E-12 7.61036E-12 8.0109E-12 8.41145E-12 8.81199E-12 9.21254E-12 9.61308E-12 1.00136E-11 1.04142E-11 1.08147E-11 1.12153E-11 1.16158E-11 1.20164E-11 1.24169E-11 1.28174E-11 1.3218E-11 1.36185E-11 1.40191E-11 1.44196E-11 1.48202E-11 1.52207E-11 1.56213E-11 1.60218E-11];

b2 = [0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.2 0.21 0.22 0.23 0.24 0.25 0.26 0.27 0.28 0.29 0.3 0.31 0.32 0.33 0.34 0.35 0.36 0.37 0.38 0.39 0.4];

%find value closest to randomly selected energy

[~,I] = min(abs(a2-e));

c2 = a2(I);

%find corresponding analysng power to that energy value

idx = find(a2 == c2);

bidx = b2(idx);

a_p = b2(idx);

value = a_p;

end

[Star Strider]

This works for me:

function value = a_p(e,a2,b2)
%analysing power
%find value closest to randomly selected energy, e
 [~,I] = min(abs(a2-e));
 c2 = a2(I);
%find corresponding analysing power to that energy value
  idx = find(a2 == c2);
  bidx = b2(idx);
  a_p = b2(idx);
  value = a_p;
end

Providing the values and calling the function:

a2 = [4.00545E-13	8.0109E-13	1.20164E-12	1.60218E-12	2.00273E-12	2.40327E-12	2.80382E-12	3.20436E-12	3.60491E-12	4.00545E-12	4.406E-12	4.80654E-12	5.20709E-12	5.60763E-12	6.00818E-12	6.40872E-12	6.80927E-12	7.20981E-12	7.61036E-12	8.0109E-12	8.41145E-12	8.81199E-12	9.21254E-12	9.61308E-12	1.00136E-11	1.04142E-11	1.08147E-11	1.12153E-11	1.16158E-11	1.20164E-11	1.24169E-11	1.28174E-11	1.3218E-11	1.36185E-11	1.40191E-11	1.44196E-11	1.48202E-11	1.52207E-11	1.56213E-11	1.60218E-11];
b2 = [0.01	0.02	0.03	0.04	0.05	0.06	0.07	0.08	0.09	0.1	0.11	0.12	0.13	0.14	0.15	0.16	0.17	0.18	0.19	0.2	0.21	0.22	0.23	0.24	0.25	0.26	0.27	0.28	0.29	0.3	0.31	0.32	0.33	0.34	0.35	0.36	0.37	0.38	0.39	0.4];

e = 42;
val = a_p(e,a2,b2)

producing:

val =
          0.4

Did you also give it value for ‘e’? If so, you didn’t post that.

[James Bagnall]

Yes it works now, e is assigned randomly via a different functions, thanks for the help

[Star Strider]

As always, my pleasure!