search character in table

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VISHNU DIVAKARAN PILLAI
VISHNU DIVAKARAN PILLAI on 13 Jan 2022
Edited: Cris LaPierre on 13 Jan 2022
symbol ={'R0';'R1';'R2';'R3';'R4';'R5';'R6';'R7';'R8';'R9';'R10';'R11';'R12';'R13';'R14';'R15';'SCREEN';'KBD';'SP';'LCL';'ARG';'THIS';'THAT'};
Address={'0';'1';'2';'3';'4';'5';'6';'7';'8';'9';'10';'11';'12';'13';'14';'15';'16384';'24576';'0';'1';'2';'3';'4'};
symboltable=table(symbol,Address);
k6 = isfield(symboltable.symbol,trim_Ainstruction)
where 'trim_Ainstruction' is a char ..and we are assigning trim_Ainstruction as screen(in char data type)
while am trying to search 'screen' in table 'symboltable' using above code, its returns zero eventhough the specific string is in the table. can anyone help me?

Answers (1)

Cris LaPierre
Cris LaPierre on 13 Jan 2022
You are not using isfield correctly. This function is for searching structure array fieldnames, not character vectors.
Consider looking into strcmp or ismember. For example
symbol ={'R0';'R1';'R2';'R3';'R4';'R5';'R6';'R7';'R8';'R9';'R10';'R11';'R12';'R13';'R14';'R15';'SCREEN';'KBD';'SP';'LCL';'ARG';'THIS';'THAT'};
Address={'0';'1';'2';'3';'4';'5';'6';'7';'8';'9';'10';'11';'12';'13';'14';'15';'16384';'24576';'0';'1';'2';'3';'4'};
symboltable=table(symbol,Address);
ismember('R6',symboltable.symbol)
ans = logical
1
  5 Comments
Cris LaPierre
Cris LaPierre on 13 Jan 2022
Yes, logical results can be used for your if condition. That's new information that was not in the original question. What is the condition you want to have?
symbol ={'R0';'R1';'R2';'R3';'R4';'R5';'R6';'R7';'R8';'R9';'R10';'R11';'R12';'R13';'R14';'R15';'SCREEN';'KBD';'SP';'LCL';'ARG';'THIS';'THAT'};
Address={'0';'1';'2';'3';'4';'5';'6';'7';'8';'9';'10';'11';'12';'13';'14';'15';'16384';'24576';'0';'1';'2';'3';'4'};
symboltable=table(symbol,Address);
isfound = ismember('R6',symboltable.symbol);
if isfound
disp('Value found in symbol')
end
Value found in symbol
As you can see if the example above, the code you have provided here returns a single value. Share the code you are running.

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