search character in table

Question

VISHNU DIVAKARAN PILLAI 2022-1-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1628240-search-character-in-table

编辑： Cris LaPierre 2022-1-13

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?

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Answer 1

Cris LaPierre 2022-1-13

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https://ww2.mathworks.cn/matlabcentral/answers/1628240-search-character-in-table#answer_873945

在 MATLAB Online 中打开

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

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VISHNU DIVAKARAN PILLAI 2022-1-13

ismember is working but its showing as array.. i need to use the result for if condition.. can u pls suggst?

Cris LaPierre 2022-1-13

编辑：Cris LaPierre 2022-1-13

在 MATLAB Online 中打开

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