Not enough input arguments

I have the error for line15 as foollows

Error in knifEdge (line 15)

NormalizedPower = TransmittedPower./max(TransmittedPower); % Normalizing Power

the code is as follows:

function [w, x0, fitresult, gof] = knifEdge(x, TransmittedPower)

% knifEdge(x,NormalizedPower)

% Knife edge method: Calculation of beam waist and center of the beam

%

% Input :

% X Input : Knife position (eg. in mm)

% Y Output: Power for each of the x position.

% Output:

% w = beam waist

% x0 = center of the beam

% fitresult : a fit object representing the fit.

% gof : structure with goodness-of fit info.

%% Fit: ‘Error Function Fitting’.

NormalizedPower = TransmittedPower./max(TransmittedPower); % Normalizing Power

x = x-min(x);

lincoeff = polyfit(x, NormalizedPower, 1);

a = lincoeff(1);

[xData, yData] = prepareCurveData( x, NormalizedPower );

% Fit Type

if a<0

ft = fittype( '0.5*(1-erf(sqrt(2).*(x-x0)./w))', 'independent', 'x', 'dependent', 'y' );

else

ft = fittype( '0.5*(1+erf(sqrt(2).*(x-x0)./w))', 'independent', 'x', 'dependent', 'y' );

end

opts = fitoptions( Method, 'NonlinearLeastSquares' );

opts.Display = Off;

opts.StartPoint = [0.913375856139019 0.63235924622541];

% Fit model to data.

[fitresult, gof] = fit( xData, yData, ft, opts );

% Plot fit with data.

figure( Name, 'Error Function Fitting' );

h = plot( fitresult, xData, yData );

legend( h, 'x vs Normalized Power' , 'Error Function Fitting', 'Location', 'NorthEast' );

w = fitresult.w;

x0 = fitresult.x0;

% Label axes

xlabel x

ylabel NormalizedPower

grid on

I have data from the experiment for x and power transmitted. I imported it into matlab as .mat format and defined x and transmittedpower from the table. But its not working . I dont know what i am missing.

[Mario Malic]

TransmittedPower is a structure?

[Emre ACAR]

It should be input from my experiment data

Answer 1

[Walter Roberson]

You are trying to execute knifEdge by name or by pressing the green Run button. You need to go to the command line and invoke it passing in the appropriate values (or do the same thing in a line of code.)

When you run a function it is not enough to have variables in the workspace that have the same names as the variables used in the function; you must pass the values in to the function.

[Emre ACAR]

I am trying to execute it by pressing Run button. How can i pass the values in to the function ?

[Walter Roberson]

Go to the command line and invoke the function there, passing in the values you need.

Or, construct a script or function that builds the inputs and passes them to the function, and use the Run button with that.

[Emre ACAR]

Doesnt work. Here is my data attached , i have no knowledge about Matlab , i just have this code and my experiment data .

[Emre ACAR]

I defined the variables in the workplace

[Emre ACAR]

in the command window i typed this >> knifEdge(x,TransmittedPower), but here i have another error now.

Error using max

Invalid data type. First argument must be numeric or logical.

Error in knifEdge (line 15)

NormalizedPower = TransmittedPower./max(TransmittedPower); % Normalizing Power

[Walter Roberson]

You need to pass numeric TransmittedPower but you are passing a table instead. You need to extract the numeric data from the table.