input function as plot title?

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Emmalie Foti
Emmalie Foti 2020-4-23
回答： Johannes Hougaard 2020-4-23
im creating a function that plots a user input function. i want the title to be just the function entered, but when i run the code, it displays the whole long vector that the function outputs.
fh=input('Enter a function: ');
minimum=min(fh)
maximum=max(fh)
plot(x,fh)
axis([a b floor(minimum) ceil(maximum)])
title(sprintf('%s',fh))
for example, if i input x^2 as the function, the graph would use 0 4 9 16 etc. as the title rather than just x^2.

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采纳的回答

madhan ravi
madhan ravi 2020-4-23
doc str2func

更多回答（1 个）

Johannes Hougaard
Johannes Hougaard 2020-4-23
I think this would do it
function_name = input('Enter a function:','s');
fh = str2func(strcat('@(x)',function_name));
fplot(fh,[min(x) max(x)]);
title(sprintf('%s',strrep(function_name,'.','')))

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