Adding only present variables

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Brett
Brett 2012-9-5
Hi Matlab friends, you guys are the best! What I am trying to do is some up a bunch of variable values, however, if the variable isn't present, the program crashes. How do I make it so it only sums the present variable values.
Here is my code:
evalin('base','save LSCvars.mat');
load LSCvars.mat
T1 = Q30 + Q29 + Q28 + Q27 + Q26 + Q25 + Q24
assignin('base','T1',T1)
T2 = D1 + D2 + D3 + D4 + D5 + D6 + D7 + D8
assignin('base','T2',T2)
T3 = (B1 + B2 + B3 + B4 + B5 + B6 + B7 + B8)/T1
assignin('base','T3',T3)
Thanks!!!

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采纳的回答

Walter Roberson
Walter Roberson 2012-9-5
Assign 0's to the variables before you do the load(), so that they will be sure to exist.

更多回答（1 个）

Image Analyst
Image Analyst 2012-9-6
编辑：Image Analyst 2012-9-6
Don't use evalin and assignin. Read in the mat file, then go through all the variables you expect to be there. If it's there, add it to your "T" variables. If it's not there for some reason, then nothing will get added.
T1 = 0;
T2 = 0;
T3 = 0;
storedStructure= load('LSCvars.mat')
hasField = isfield(storedStructure, 'Q24');
if hasField
T1 = T1 + Q24;
end
hasField = isfield(storedStructure, 'Q25');
if hasField
T1 = T1 + Q25;
end
and so on for the other T's and Q's.
  1 个评论
Walter Roberson
Walter Roberson 2012-9-6
T1 = 0;
for field_name = {'Q24', 'Q25', 'Q30'} %etc
if isfield(storedStructure, field_name)
T1 = T1 + storedStructre.(field_name);
end
end

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