How can I solve this little error?

Hello everyone,

I get this little error while plotting (plot (datetimeDATIMAR and datetimeDATIECMWF).

How can I solve it?

Thank you.

clear all
close all

load('giulia_TT.mat')

giulia_monthly=retime(giulia_TT,'monthly','mean');

load('giulia_monthly_DELTA');

E = giuliamensile.Height 
NEW_6=E *0.35 *10;

% c=giuliamensile{:,1};
% c=datetime(c,'InputFormat','MM-yyyy');
plot(giulia_monthly.Time,NEW_6(:,1),'g-^' ,'MarkerEdgeColor','k','MarkerFaceColor','g') ;
hold on

%FILTERING
%ag2000-sept2000
for i =33:34
   if  NEW_6(i,1)>=150
       NEW_6(i)=NaN;
   end
       
      
end

plot(giulia_monthly.Time,NEW_6(:,1),'g-^' ,'MarkerEdgeColor','k','MarkerFaceColor','g') ;
hold on

%sept2001-oct2001
for i =46:47
   if  NEW_6(i,1)>=200
       NEW_6(i)=NaN;
   end
       
       
end

plot(giulia_monthly.Time,NEW_6(:,1),'g-^' ,'MarkerEdgeColor','k','MarkerFaceColor','g') ;
hold on

%sept2005
for i =94:94
   if  NEW_6(i,1)>=300
       NEW_6(i)=NaN;
   end
       
      
end

plot(giulia_monthly.Time,NEW_6(:,1),'g-^' ,'MarkerEdgeColor','k','MarkerFaceColor','g') ;
hold on

%sept2008-Oct2008
for i =130:131
   if  NEW_6(i,1)>=230
       NEW_6(i)=NaN;
   end
       
      
end

plot(giulia_monthly.Time,NEW_6(:,1),'g-^' ,'MarkerEdgeColor','k','MarkerFaceColor','g') ;
hold on

%sept2007-Nov2007
for i =118:120
   if  NEW_6(i,1)>=325
       NEW_6(i)=NaN;
   end
       
       
end

plot(giulia_monthly.Time,NEW_6(:,1),'g-^' ,'MarkerEdgeColor','k','MarkerFaceColor','g') ;
hold on

%RIALZARE
%dic2007-nov2013
for i=121:192
     NEW_6(i,1)=NEW_6(i,1)+171.68
end

plot(giulia_monthly.Time,NEW_6(:,1),'g-^' ,'MarkerEdgeColor','k','MarkerFaceColor','g') ;

%filter
%giugno 2009-aug 2009
for i =139:141
   if  NEW_6(i,1)>=500
       NEW_6(i)=NaN;
   end
         
    
end

plot(giulia_monthly.Time,NEW_6(:,1),'g-^' ,'MarkerEdgeColor','k','MarkerFaceColor','g') ;
hold on

%luglio 2011-aug 2011
for i =164:165
   if  NEW_6(i,1)>=500
       NEW_6(i)=NaN;
   end
       
     
end

plot(giulia_monthly.Time,NEW_6(:,1),'g-^' ,'MarkerEdgeColor','k','MarkerFaceColor','g') ;
hold on

%RIALZARE
%jan 2014
for i=194:254
     NEW_6(i,1)=NEW_6(i,1)+584.0204
end

plot(giulia_monthly.Time,NEW_6(:,1),'g-^' ,'MarkerEdgeColor','k','MarkerFaceColor','g') ;


%FILTERING
%AUG2016-SEP2016
for i =225:226
   if  NEW_6(i,1)>=1000
       NEW_6(i)=NaN;
   end
       
    
end

plot(giulia_monthly.Time,NEW_6(:,1),'g-^' ,'MarkerEdgeColor','k','MarkerFaceColor','g') ;
hold on

%JUN2015-SEP2015
for i =211:214
   if  NEW_6(i,1)>=800
       NEW_6(i)=NaN;
   end
       
    
    
end

plot(giulia_monthly.Time,NEW_6(:,1),'g-^' ,'MarkerEdgeColor','k','MarkerFaceColor','g') ;
hold on

load('DATI_ECM_MENSILI');
load('DATI_MAR_MENSILI');

plot(datetime(DATIMARmensili.Year(20:end,1),1,1),(DATIMARmensili.Month(20:end,1),1,1) DATIMARmensili.SMB_mpmm(20:end,1),'--co', 'MarkerEdgeColor','k','MarkerFaceColor','c', 'DisplayName','ECMWF');

Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

Error in connector.internal.fevalMatlab

Error in connector.internal.fevalJSON

hold on
plot(datetime(DATIECMmensili.Year,1,1),(DATIECMmensili.Month,1,1),DATIECMmensili.SMB_mp_mm,'m-*', 'DisplayName','MAR');

legend('Location','best')

hold on

Answer 1

[Walter Roberson]

plot(datetime(DATIMARmensili.Year(20:end,1),1,1),(DATIMARmensili.Month(20:end,1),1,1) DATIMARmensili.SMB_mpmm(20:end,1),'--co', 'MarkerEdgeColor','k','MarkerFaceColor','c', 'DisplayName','ECMWF');
                                                                                     ^

At the marked place, you have just finished the second parameter (DATIMARmensili.Month(20:end,1),1,1) and then you have a space and then you have an expression. You do not have any operator between the () expression and the following DATIMARmensili expression.

In MATLAB, the cases in which it is permitted to have two expressions separated by a space, with no operator between them, are:

1. You are at the first bracket nesting level within a [] list-building expression. For example, [1 a+2 3] is valid. In this case, the spaces are interpreted as-if you had a comma there, equivalent to [1, a+2, 3] in this example.
2. You are at the first bracket nesting level within a {} cell-building expression. For example, {1 a+2 3} is valid. In this case, the spaces are interpreted as-if you had a comma there, equivalent to {1, a+2, 3} in this example.

... And that is it. Every other case in which you have two expressions in a row without an operator between them, is an error in MATLAB.

MATLAB has absolutely no implied multiplication. Not anywhere.

That said... your line is basically a mistake in nearly every component. I showed you a more correct line at https://www.mathworks.com/matlabcentral/answers/897572-how-to-plot-this-line#answer_766657

[Pul]

Thank you.

I wrote (20:end,1),1,1) because my data have to start from 1980.

By the way, doing in the way you showed me, I get this error:

(datetime([DATIECMWFmensili.Year, DATIECMWFmensili.Month], DATIECMWFmensili.SMB_mpmm, 'm-*', 'DisplayName','ECMWF'));

"Error using datetime

Wrong number of arguments.!

[Walter Roberson]

plot(datetime([DATIECMWFgiornalieri.Year, DATIECMWFgiornalieri.Month, DATIECMWFgiornalieri.Days]), DATIECMWFgiornalieri.SMB_mpmm, 'm-*', 'DisplayName','ECMWF');

[Pul]

It doesn't work.

If you have seen my previous comment you can have noticed the variable is different from the other question.

Moreover, I need my data start from a specific year.

[Walter Roberson]

plot(datetime(DATIECMWFmensili.Year(20:end), DATIECMWFmensili.Month(20:end), 1), DATIECMWFmensili.SMB_mpmm, 'm-*', 'DisplayName','ECMWF');

[Pul]

Thanks, but you should have added (20:end) at DATIECMWFmensili.SMB_mpmm.

In this way, it works.