strcmp with or-condition

Question

Max Bornemann 2019-4-15

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https://ww2.mathworks.cn/matlabcentral/answers/456464-strcmp-with-or-condition

评论： Ben Cunningham 2019-4-23

采纳的回答： Ben Cunningham

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Hello,

i have the following two tables:

Tab1=table('Size',[9 3],'VariableTypes',{'cell','double','double'},'VariableNames',{'Description','Year','Value'});
Tab1.Description(:)={'Gas','Gas','Gas','Pellets','Pellets','Pellets','Oil','Oil','Oil'};
Tab1.Year(:)=[2015,2020,2025,2015,2020,2025,2015,2020,2025];
Tab2=table('Size',[6 3],'VariableTypes',{'cell','double','double'},'VariableNames',{'Description','Year','Value'});
Tab2.Description(:)={'Wood','Wood','Wood','FW','FW','FW'};
Tab2.Year(:)=[2015,2020,2025,2015,2020,2025];
Tab2.Value(:)=[5,10,17,7,25,75];

I try the following calculation:

Tab1(strcmp(Tab1.Description,or('Gas','Oil')),'Value')=Tab2(strcmp(Tab2.Description,'FW'),'Value');

The or-part seems to be the problem. I want the Value of 'FW' from Tab2 as the Value of 'Gas' and 'Oil' in Tab1. My original table is way bigger, so seperate calculations like:

Tab1(strcmp(Tab1.Description,'Gas'),'Value')=Tab2(strcmp(Tab2.Description,'FW'),'Value');
Tab1(strcmp(Tab1.Description,'Oil'),'Value')=Tab2(strcmp(Tab2.Description,'FW'),'Value');

are not purposeful. Maybe an if-condition with

||

could help, but i dont know how.

I will greatly appreciate any assistance.

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Max Bornemann 2019-4-15

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Hello madhan ravi,

the output should be the same as with the following calculation:

Tab1(strcmp(Tab1.Description,'Gas'),'Value')=Tab2(strcmp(Tab2.Description,'FW'),'Value');
Tab1(strcmp(Tab1.Description,'Oil'),'Value')=Tab2(strcmp(Tab2.Description,'FW'),'Value');

Table looks like:

Description   Year            Value
_________________________________________
'Gas'	        2015	        7
'Gas'	        2020	        25
'Gas'	        2025	        75
'Pellets'	2015	        0
'Pellets'	2020	        0
'Pellets'	2025	        0
'Oil'	        2015	        7
'Oil'	        2020	        25
'Oil'	        2025	        75

Max Bornemann 2019-4-16

Can someone help?

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Answer 1

Ben Cunningham 2019-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/456464-strcmp-with-or-condition#answer_370887

编辑：Ben Cunningham 2019-4-16

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Generally I would recommend just writing out two lines as Adam proposed earlier.

But if you really want 'one line' with a list of strings to index then you could wrap it in a for loop :

for DescriptionIndex = {'Gas', 'Oil'}, Tab1(strcmp(Tab1.Description, DescriptionIndex),'Value')=Tab2(strcmp(Tab2.Description,'FW'),'Value'); end

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Max Bornemann 2019-4-22

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I just have a further question, Mr. Cunningham.

Lets say i have the following tables:

Tab1=table('Size',[5 2],'VariableTypes',{'cell','double'},'VariableNames',{'Description','Value'});
Tab1.Description(:)={'Gas','Pellets','Oil','Electricity','Heatpump'};
Tab1.Value(:)=[5,10,17,7,25];
Tab2=table('Size',[7 2],'VariableTypes',{'cell','double'},'VariableNames',{'Description','Value'});
Tab2.Description(:)={'Districtheat','Coal','Gas','Pellets','Oil','Electricity','Heatpump'};
Tab3=table('Size',[4 2],'VariableTypes',{'cell','double'},'VariableNames',{'Description','Value'});
Tab3.Description(:)={'Wood','NaturalGas','HeatingOil','Heat'};
Tab3.Value(:)=[1,2,3,4];

This is the calculation i want to do:

for Sum2={'Wood','HeatingOil','Heat'}
for Sum1={'Pellets','Oil','Heatpump'}
    Tab2{strcmp(Tab2.Description,Sum1),'Value'}=Tab1{strcmp(Tab1.Description,Sum1),'Value'}+Tab3{strcmp(Tab3.Description,Sum2),'Value'};
end
end

Is there a way to calculate both for-Loops at the same time? So calculation of entry 1 of Sum1 with entry 1 of Sum2 and so on.

So the 'long' way for what i want would be:

Tab2{strcmp(Tab2.Description,'Pellets'),'Value'}=Tab1{strcmp(Tab1.Description,'Pellets'),'Value'}+Tab3{strcmp(Tab3.Description,'Wood'),'Value'};
Tab2{strcmp(Tab2.Description,'Oil'),'Value'}=Tab1{strcmp(Tab1.Description,'Oil'),'Value'}+Tab3{strcmp(Tab3.Description,'HeatingOil'),'Value'};
Tab2{strcmp(Tab2.Description,'Heatpump'),'Value'}=Tab1{strcmp(Tab1.Description,'Heatpump'),'Value'}+Tab3{strcmp(Tab3.Description,'Heat'),'Value'};

Max Bornemann 2019-4-22

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Found the solution to my problem :-)

for Sum1={'Pellets','Oil','Heatpump';'Wood','HeatingOil','Heat'}
    Tab2{strcmp(Tab2.Description,Sum1(1,:)),'Value'}=Tab1{strcmp(Tab1.Description,Sum1(1,:)),'Value'}+Tab3{strcmp(Tab3.Description,Sum1(2,:)),'Value'};
end

Ben Cunningham 2019-4-23

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Well found!

If you are doing this mulitiple times you might consider putting this code in a nicely named function which may help it look clearer.

(Name the function something that makes sense for what you are doing - also the variables might benefit from clearer names).

e.g. At the end of your script :

function TabOut = myFunctionName (Tab1, Tab2, Tab3, Sum)
    % My Function does something
    for Sum1 = Sum
        Tab2{strcmp(Tab2.Description,Sum1(1,:)),'Value'}=Tab1{strcmp(Tab1.Description,Sum1(1,:)),'Value'}+Tab3{strcmp(Tab3.Description,Sum1(2,:)),'Value'};
    end
    TabOut = Tab2;
end

Then in your script you can write :

Tab2 = myFunctionName (Tab1, Tab2, Tab3, {'Pellets','Oil','Heatpump';'Wood','HeatingOil','Heat'})

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Answer 2

Adam Danz 2019-4-16

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编辑：Adam Danz 2019-4-16

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You would use ismember() to find the rows of Tab1.Description that match a list of options.

ismember(Tab1.Description, {'Gas', 'Oil'})

However, you'll find out that this matches 6 rows but the data on the right hand side of the equal sign only produces 3 rows.

What I think you're trying to do is to assign those 3 values to all rows in Tab1 that are labeled 'Gas' and to assign those 3 values to all rows labeled 'Oil', too.

Tab1(strcmp(Tab1.Description,'Gas'),'Value')=Tab2(strcmp(Tab2.Description,'FW'),'Value');
Tab1(strcmp(Tab1.Description,'Oil'),'Value')=Tab2(strcmp(Tab2.Description,'FW'),'Value');

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Adam Danz 2019-4-16

Nice! Glad it worked out. My advice is to write the for-loop using separate lines rather than forcing it into a single line. It doesn't change the speed of performance - it's just more readable as separate lines.

Ben Cunningham 2019-4-16