MATLAB: How i can have dimension input of a defined function like f

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i have a code that input of its a handle function like f, in duration of this code i need to number of input this function for example f is: f=@(x,y)(x+y)

Best Answer

f=@(x,y)(x+y)
s=func2str(f);
a=regexp(s,'(?<=@\()[\w,]+(?=\))','match')
out=numel(cell2mat(regexp(a,'\w+')))

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MATLAB: Fprintf %f

Your format specifier string expects Data to have the form "string number string number string number etc." Apparently Data{1} is a string but I'm not sure Data{3} and Data{5} are. They're probably numbers, not strings, so when it tries to print those numbers out as strings (according to %s) you get the unexpected results. Show us how you constructed Data.

MATLAB: Undefined function ‘f’

Either write all the functions in one file like this. (Also note that I have made few changes in your code.)

tmesh = linspace(0,pi/2,5);
solinit = bvpinit(tmesh, @f);
sol = bvp4c(@odefun, @bcfun, solinit);
plot(sol.x, sol.y, '-o');
function dzdt = odefun(t,z)
    dzdt = zeros(2,1);  
    dzdt = [z(2); z(1)]; % <----- This should be a 2x1 vector
end
% boundary conditions

function res = bcfun(za, zb)
    res = [za(1); zb(2)-2]; % <---- boundary conditions are written like this, zb(pi/2) is invalid
end
% Initial guess

function g = f(t)
    g = [sin(t) cos(t)];
end

Or create 4 files like this.

main_script:

tmesh = linspace(0,pi/2,5);
solinit = bvpinit(tmesh, @f);
sol = bvp4c(@odefun, @bcfun, solinit);
plot(sol.x, sol.y, '-o');

odefun.m:

function dzdt = odefun(t,z)
    dzdt = zeros(2,1);  
    dzdt = [z(2); z(1)];    
end

bcfun.m:

% boundary conditions
function res = bcfun(za, zb)
    res = [za(1); zb(2)-2];
end

f.m:

% Initial guess
function g = f(t)
    g = [sin(t) cos(t)];
end

Best Answer

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