why won't the command semilogy work?

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SOFIA
SOFIA 2024-4-12
编辑： John D'Errico 2024-4-12
Whenever I try to create a figure using the command semilogy, the figure opens up but it's a blank page and it doesn't give me the graph.
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SOFIA
SOFIA 2024-4-12
Ran in:
figure(4)
semilogy (1:iter3N, abs(scarti3N), 'r-');
Unrecognized function or variable 'iter3N'.
hold on
semilogy (1:itertf3, abs(scartitf3), 'b-');
hold on
semilogy(1:iter3,abs(scarti3), 'm-');
title('convergence');
xlabel('iter');
ylabel('error');
legend('Newton-rhapson','tangente fissa','punto fisso');
hold off
John D'Errico
John D'Errico 2024-4-12
编辑：John D'Errico 2024-4-12
So your example where semilogy does not work, is the case of an undefined variable? You cannot plot something if it does not exist.
Unrecognized function or variable 'iter3N'.
Unless, of course, you have a beta copy of the mind reading toolbox. It was never officially released, as it is really buggy.
Seriously, READ THE ERROR MESSAGE. While you may think the variable iter3N exists somewhere, it is not in the workspace accessible to that call.

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