CODEWITHSUNDEEP
matlab
polishusar
polishusar

Reputation: 31

program isnt working because of an error in y

this is my program, its supposed to get an input from the user for the starting x value, stepping value, and an ending x value, the user also inputs the y function he likes, the graph is then supposed to graph it but i keep getting an error, any ideas?

clear all ; % clear memory
close all ; % close any open figures
drawnow ; % update screen now
clc ; % clear screen


display('** Welcome to Plotting Program **') ;
display(' ');

start=input('please enter starting x value:');
step=input('please enter ending x value:');
stop=input('please enter step value:');

y= double(input('please input your equation:'));

x=double(start:step:stop);


plot(x,y);

Upvotes: 0

Views: 34

Answers (1)

Oleg
Oleg

Reputation: 10676

You can use str2func() to convert string input into a function handle:

y = input('Input only the RHS of your equation as a function of ''x'' and enclose in '': ')
y = str2func(['@(x)' y]);
plot(x,y(x))

Also note that double(start:step:stop) will not work, since you are converting chars to their ASCII mapping:

double('20')
ans =
    50    48

Use instead str2double(input('...'))

Upvotes: 1

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