Simple Problem - Not enough input arguments

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Josh V 2015-8-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/236646-simple-problem-not-enough-input-arguments

评论： mashtine 2015-8-26

Ive used the following code frequently without problem, and suddenly encountered a problem. The code is as follows:

%%Compute daily returns
returns = diff(price);
%%compute daily log-returns
lreturns = diff(log(price));
%%Plot log returns
figure()
plot(date(2:end),lreturns)
title('Portfolio log-returns')
xlabel('Date')
ylabel('log-returns')

Fairly straight forward code. Calculate the returns, calculate the log of returns, plot the date against the log of returns. Always worked fine in the past, even worked yesterday on a shorter version of the data I'm using today (same format). However, today I am getting the error message:

Error using plot
Not enough input arguments.
Error in Log_Return (line 7)
plot(date(2:end),lreturns)

For some reason, if I do the following:

%%Compute daily returns
returns = diff(price);
%%compute daily log-returns
lreturns = diff(log(price));
%%Plot log returns
date1 = date(2:end);
figure()
plot(date(2:end),lreturns)
title('Portfolio log-returns')
xlabel('Date')
ylabel('log-returns')

Including the definition on line 6 of 'date1' it works fine.

Firstly I dont understand why it suddenly isn't working. Secondly, I dont see how including the definition of 'date1' has any impact on the plot since date1 isn't used in the plot.

Thanks