how to plot winter rainfall data with trend line

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skyhunt
skyhunt 2015-10-11
评论： dpb 2015-10-12
1977-78 17,
1978-79 29,
1979-80 8,
1980-81 4,

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回答（1 个）

dpb
dpb 2015-10-11
y=[78:81].';r=[17 29 8 4].';
plot(y,r)
b=polyfit(y,r,1);
rhat=polyval(b,y);
hold on,plot(y,rhat,'r')
set(gca,'xtick',y)
xlim([y(1)-0.5 y(end)+0.5])
set(gca,'xticklabel',num2str([y-1 y]+1900,'%d-%d'))
xlabel('Winter Season of')
ylabel('Season rainfall (in)')
Salt to suit...
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skyhunt
skyhunt 2015-10-12
编辑：dpb 2015-10-12
[y1, y2, p]=textread('1.txt','%4d-%2d %f');
plot(y1,p)
b=polyfit(y1,p,1);
rhat=polyval(b,y1);
hold on,plot(y1,rhat,'r')
set(gca,'xtick',y1)
xlim([y1(1)-0.5 y1(end)+0.5])
set(gca,'xticklabel',num2str([y1-1 y1]+1900,'%d-%d'))
xlabel('Winter Season')
ylabel('Season rainfall (mm)')
x-axis some problem...please check it sir...
dpb
dpb 2015-10-12
That's the comment I made earlier re: using 2-yr vis a vis 4-yr dates. "Exercise for the student..." :)
Decide what you want the labeling to be and then figure out the formatting to produce that. You could simply start with using y1 alone but it should be obvious that adding 1900 to an already-four-year value isn't going to be what you want.

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