How to find a sine function of a plot graph using dam level data for a period of a time..I have use the below code for that and it doesnt give any clear sine curve. We need to plot the sine function graph function in the same plot. and need to just need to use the below codee $\%$

figure;

plot$($date$,$ volume, $\text{'}$o$\text{'},$ 'MarkerFaceColor', $\text{'}$b$\text{'},$ 'MarkerSize', $4)$;

hold on;

$\%$ Customize plot

title$(\text{'}$Monthly Dam Volume in $2023\text{'})$;

xlabel$(\text{'}$Month$\text{'})$;

ylabel$(\text{'}$Volume $($GL$)\text{'})$;

legend$(\text{'}$Data$\text{'},$ 'Trigonometric Fit'$)$;

grid on;

$\%$ Define the range for x

x $=$ linspace$(-$pi$,$ pi$,100)$;

$\%$ Initial values for parameters a$,$ b$,$ c$,$ d

a $=1$;

b $=0\mathrm{.}7$;

c $=1/4$;

d $=0\mathrm{.}1$;

$\%$ Plot the initial trigonometric function

f $=$ c $*$ sin$($a $*$ x $+$ b$)+$ d;

plot$($x$,$ f$,\text{'}$m$\text{'},$ 'LineWidth', $2)$;

title$($sprintf$(\text{'}$Trigonometric Function: c$*$sin$($a$*$x$+$b$)+$d$,$ a$=\%\mathrm{.}2$f$,$ b$=\%\mathrm{.}2$f$,$ c$=\%\mathrm{.}2$f$,$ d$=\%\mathrm{.}2$f$\text{'},$ a$,$ b$,$ c$,$ d$))$;

xlabel$(\text{'}$x$\text{'})$;

ylabel$(\text{'}$f$($x$)\text{'})$;

hold off;