not enough input arg

%function definition
function [eco1, eco2, ag2, eco3, ag3, eco4, ag4, eco5, ag5, eco6, eco7, P] = fcn (TX, TY, TZ, RX, RY, RZ, CX, CY, CZ)

% D1 = sqrt((x2-x1)^2 + (y2-y1)^2 + (z2-z1)^2)
%%Rxc2 = [2*w-x2, y2, z2]
% D2 = sqrt(((2*w-x2)-x1)^2 + (y2-y1)^2 + (z2-z1)^2)
%%Rxc3 = [-x2, y2, z2]
% D3 = ((-x2-x1)^2 + (y2-y1)^2 + (z2-z1)^2)
%%Rxc4 = [x2, y2, 2*D-z2]
% D4= sqrt((x2-x1)^2 + (y2-y1)^2 + ((2*D-z2)-z1)^2)
%%Rxc5 = [x2, y2, -z2]
% D5 = sqrt((x2-x1)^2 + (y2-y1)^2 + (-z2-z1)^2)
% Case z1==z2, i.e. at the same level the echoes are the same
%%Rxc6 = [x2, -y2, z2]
% D4 = sqrt((x2-x1)^2 + (-y2-y1)^2 + (z2-z1)^2)
%%Rxc7 = [x2, 2*L-y2, z2]
% D5 = sqrt((x2-x1)^2 + ((2*L-y2)-y1)^2 + (z2-z1)^2)

% result signal

eco1 = sqrt((RX-TX)^2 + (RY-TY)^2 + (RZ-TZ^2));

eco2 = sqrt(((2*CX-RX)-TX)^2 + (RY-TY)^2 + (RZ-TZ)^2);

ag2 = asin(abs((2*CX-RX)-TX)/eco2);
eco3 = sqrt((-RX-TX)^2 + (RY-TY)^2 + (RZ-TZ)^2);
ag3 = asin((RX+TX)/eco3);
eco4 = sqrt((RX-TX)^2 + (RY-TY)^2 + (-RZ-TZ)^2);
ag4 = asin(abs((2*CZ-RZ)-TZ)/eco4);
eco5 = sqrt((RX-TX)^2 + (RY-TY)^2 + (-RZ-TZ)^2);
ag5 = asin((RZ+TZ)/eco5);

if ((RZ==TZ) && (RX==TX))
    eco6 = (RY+TY);
    eco7 = sqrt(((2*CY-RY)-TY)^2);
else 
    eco6 = 0;
    eco7 = 0;

end

P=(RZ+TZ)/2;

[Stephen23]

Please give us the complete error message, this means all of the red text. The complete error message has useful information for us to understand the problem.

Also you might like to replace your numbered outputs eco1,eco2,ag2,eco3,etc with a non-scalar structure. This would make passing the values more robust, and avoids the poor code practices that beginners always try to use with numbered variables:

http://www.mathworks.com/matlabcentral/answers/196952-how-to-create-new-variables-in-batches-with-strcat

[Walter Roberson]

How have you invoked this code?

[tier el]

>> mtph Error using mtph (line 21) Not enough input arguments.

[Stephen23]

The name mtph does not exist in your code. You need to show us where the function (or script) mtph is actually used.

[tier el]

i've saved the m file as mtph and tried to run but got no result on not enough input arguments

[Stephen23]

How are you trying to run it? Are you calling it from another function or script, calling it from the command line, or clicking the Run button in the MATLAB toolbar?

You should make sure that the function and the Mfile both have the same name. This is what the function documentation recommends:

"Save the function code in a text file with a .m extension. The name of the file should match the name of the first function in the file."

[tier el]

By running it on the matlab toolbar. How should i save it then?

[Stephen23]

Walter Roberson has already told you how, see their Answer.

You cannot run a function that requires input arguments by simply clicking on that toolbar button. It is easiest to call the function from the command window (or from another function or script), together with all of its required input arguments.

Answer 1

[Walter Roberson]

Your first non-comment line is

function [eco1, eco2, ag2, eco3, ag3, eco4, ag4, eco5, ag5, eco6, eco7, P] = fcn (TX, TY, TZ, RX, RY, RZ, CX, CY, CZ)

This declares a function named "fcn". You need to store that in a file named fcn.m

When you run the function from the command prompt, you need to provide parameters to run it with. For example,

>> fcn(rand(), rand(), rand(), rand(), rand(), rand(), rand(), rand(), rand())

[tier el]

ur last line fcn(rand()...then i input the Tx, Ty and so on there?

[tier el]

infact i'm getting errors at line 21, i.e eco1

[Walter Roberson]

I took your code unchanged:

>> fcn(rand(), rand(), rand(), rand(), rand(), rand(), rand(), rand(), rand())

ans =

            0.40732350841585

Your code is designed to handle only scalar inputs. If you are trying to pass in vector or matrix inputs then you will need to change all of your ^ to .^ and all of your / to ./ but more importantly you would need to re-code your "if" because it is designed only for scalar values.