How can I plot this?

Question

Pul 2021-9-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1445344-how-can-i-plot-this

评论： Star Strider 2021-9-2

采纳的回答： Star Strider

在 MATLAB Online 中打开

Hello everyone,

I should plot the magenta data (Cum_smbp.SMB_mpmm) until 30/1/2019.

I tried in this way: plot(DTv,table2array(Cum_smbp(:,16),Cum_smbp.SMB_mpmm(1:7700),'m', 'DisplayName')), without success.

Can anyone help me please?

Thanks.

load('GIULIA_MMEQ1.mat');
A=GIULIAMMEQ1.Var4;
B=str2double(A);
NEW= B * 10 * 0.35;
C=GIULIAMMEQ1.Dec1997;%array2table
C=replace(C,"';","");
C=datetime(C,'InputFormat','dd MMM yyyy'); %convert to datetime format
plot(C,NEW) 
load('DATI_ECM_GIORNALIERI')
DTv = datetime(DATIECMWFgiornalieri{:,1:3})
smb=table2array(DATIECMWFgiornalieri(:,16))
for i =1:8402
   if   isnan(smb(i))
       smb(i)=0;
   end
end
Cum=cumsum(smb)
Cum_smbp=DATIECMWFgiornalieri;
Cum_smbp(:,16)=array2table(Cum)
plot(C,NEW, 'DisplayName') 
hold on
plot(DTv,table2array(Cum_smbp(:,16)),'m', 'DisplayName');
plot(DTv,table2array(Cum_smbp(:,16),Cum_smbp.SMB_mpmm(1:7700),'m', 'DisplayName'));
legend('Location','best')

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Answer 1

Star Strider 2021-9-2

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Try this (slightly edited version) —

load('GIULIA_MMEQ1.mat');
A=GIULIAMMEQ1.Var4;
B=str2double(A);
NEW= B * 10 * 0.35;
C=GIULIAMMEQ1.Dec1997;%array2table
C=replace(C,"';","");
C=datetime(C,'InputFormat','dd MMM yyyy'); %convert to datetime format
plot(C,NEW) 
load('DATI_ECM_GIORNALIERI.mat')
DTv = datetime(DATIECMWFgiornalieri{:,1:3});
smb=table2array(DATIECMWFgiornalieri(:,16));
smb = fillmissing(smb, 'constant',0);
% for i =1:8402
%    if   isnan(smb(i))
%        smb(i)=0;
%    end
% end
Cum=cumsum(smb);
Cum_smbp=DATIECMWFgiornalieri;
Cum_smbp(:,16)=array2table(Cum);
plot(C,NEW, 'DisplayName','First Plot') 
hold on
plot(DTv,table2array(Cum_smbp(:,16)),'m', 'DisplayName','Second Plot');
plot(DTv,table2array(Cum_smbp(:,16),Cum_smbp.SMB_mpmm(1:7700)),'m', 'DisplayName','Third Plot');
legend('Location','best')

producing:

.

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Pul 2021-9-2

Yes, now I got what I needed.

Thank you!

Star Strider 2021-9-2

As always, my pleasure!

.

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Answer 2

Cris LaPierre 2021-9-2

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https://ww2.mathworks.cn/matlabcentral/answers/1445344-how-can-i-plot-this#answer_779519

编辑：Cris LaPierre 2021-9-2

在 MATLAB Online 中打开

There are some inconsistencies in your code. The issue with the line you are questioning is that you have one X input and 2 Y inputs. You can plot multiple lines in a single plot command, but you must use the correct syntax.

plot(X1,Y1,LineSpec1,...,Xn,Yn,LineSpecn)

Also note that DTv has 8402 rows and Cum_smbp.SMB_mpmm(1:7700) will have 7700, so you have more X data points than Y data points. This will give you an error.

You can use a logical array to identify data that meets a conditional requirement. See Ch 12 of MATLAB Onramp on how to do this. Use that array as an index to select the data to plot.

x=1:5;

y=x.^2;

ind = y<10

ind = 1×5 logical array

1 1 1 0 0

plot(x(ind),y(ind),'m-o')

Some other things

'DisplayName' is a Name-Value pair input. You need to include both (e.g. plot(C,NEW, 'DisplayName','Line1')
It is best practice to always pair hold on with a corresponding hold off
There is no need to do table2array(Cum_smbp(...)). See the Access Data in Tables page for more.