how to solv this issue?

You must write a function called savefunc(name,func,grd) whose function is to display a graph that displays data from a random range.

example:

[Image Analyst]

Why must I do that?

This looks like your homework problem.

Is the assignment "Post the question on the Answers forum and take a solution someone posted there and submit it as your answer."?

If you have any questions ask your instructor or read the link below to get started:

How do I get help on homework questions on MATLAB Answers? - MATLAB Answers - MATLAB Central

Obviously we can't give you the full solution because you're not allowed to turn in our code as your own.

[daniel]

function savefunc(file,fx,grd)

range=sort(rand(1,2));

x=linspace(range(1),range(2), 100);

y=eval(fx);

plot(x,y)

switch grd

case 'on'

grid on;

case 'off'

grid off;

end

[daniel]

here is my code

[Image Analyst]

OK, so did it work when you passed in the arguments they told you to pass in?

[daniel]

no its not working

[Sulaymon Eshkabilov]

Share you have for these input args: file,fx,grd

Answer 1

[Jan]

Replace

y=eval(fx);

by

y = fx(x)

and

switch grd
 case 'on'
 grid on;
 
 case 'off'
 grid off;
end

by the easier:

grid(grd)

[Walter Roberson]

Looks like they expect a character vector for the function.

Answer 2

[Image Analyst]

Your code runs without error:

savefunc('test', 'x.*sin(x)', 'off')

function savefunc(file,fx,grd)
range=sort(100 * rand(1,2));
x=linspace(range(1),range(2), 100);
y=eval(fx);
plot(x,y)
switch grd
    case 'on'
        grid on;
    case 'off'
        grid off;
end
caption = sprintf('The function range is between %.4f <= x <= %.4f', range(1), range(2));
title(caption)
xlabel('x')
ylabel('y')
end

To match the picture you'll need to change the range to 50 to 83.

You probably just never executed the command

>> savefunc('test', 'x.*sin(x)', 'off')

in the command window.

Also range is a built-in function.

Answer 3

[daniel]

[Torsten]

Did you save your function as "savefunc.m" in your working directory ?

[daniel]

no

[Torsten]

Then do it. MATLAB searches for savefunc.m, but cannot find it anywhere.

Answer 4

[Sulaymon Eshkabilov]

Here is the corrected code:

savefunc('Test', 'x.*sin(x)', 'off')

function savefunc(file,fx, grd)
    fileNAME=file;
    f = fx;
    range=sort(rand(1,2))*100;
    x=linspace(range(1), range(2), 1000);
    y=eval(f);
plot(x,y)
xlabel('x'), ylabel(f), 
switch grd
    case 'on'
        grid on;
    case 'off'
        grid off;
end
title(['The function range between: '  num2str(x(1))  '< x < '  num2str(x(2))])
D = [x.' y.'];
writematrix(D, strcat([fileNAME '.txt']));  % Simulation data is stored 
end

[daniel]

same messege

[Sulaymon Eshkabilov]

Your are executig the fcn incorrectly. Run the code as this way from one M-file eg.:

savefunc('Test', 'x.*sin(x)', 'off')

function savefunc(file,fx, grd)
    fileNAME=file;
    f = fx;
    range=sort(rand(1,2))*100;
    x=linspace(range(1), range(2), 1000);
    y=eval(f);
plot(x,y)
xlabel('x'), ylabel(f), 
switch grd
    case 'on'
        grid on;
    case 'off'
        grid off;
end
title(['The function range between: '  num2str(x(1))  '< x < '  num2str(x(2))])
D = [x.' y.'];
writematrix(D, strcat([fileNAME '.txt']));  % Simulation data is stored 
end

or recall the fucntion file from the command window, e.g:

function savefunc(file,fx, grd)   % saved M-file called savefcn the resides in your current MATLAB directory
    fileNAME=file;
    f = fx;
    range=sort(rand(1,2))*100;
    x=linspace(range(1), range(2), 1000);
    y=eval(f);
plot(x,y)
xlabel('x'), ylabel(f), 
switch grd
    case 'on'
        grid on;
    case 'off'
        grid off;
end
title(['The function range between: '  num2str(x(1))  '< x < '  num2str(x(2))])
D = [x.' y.'];
writematrix(D, strcat([fileNAME '.txt']));  % Simulation data is stored 
end

Call it from the command window:

>> savefunc('Test', 'x.*sin(x)', 'off')

Answer 5

[Walter Roberson]

there is no savefunc() built into matlab or any of the toolboxes or any of the file exchange contributions. Your task is create your own function for it.

There is no particular location where you must save the function file, but it must exist in your current directory or somewhere along the matlab "path" (see pathtool). There are, though, some locations best avoided:

• directories named "resources" cannot be used
• if the directory is named "private" then the function can only be called by functions in the parent directory
• if the directory or a parent directory is named starting with a + then there are special ways to invoke the function
• if the directory or a parent directory is named starting with a @ then it is part of a class definition and special ways of calling it might apply
• do not store your code anywhere under the MATLAB installation directory; there may be security restrictions or matlab might refuse to recognize the file unless you use special steps, or in some cases might say that you need the license from a different toolbox (some directory names are magic inside the matlab installation directory)