How do I stop strings in matrices from displaying as NaN when using disp()?

Question

Edoardo Modestini 2023-5-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1956179-how-do-i-stop-strings-in-matrices-from-displaying-as-nan-when-using-disp

回答： Walter Roberson 2023-5-1

Hi,

I'm trying to get my function to output arrays where the first element is a string giving the stage number, and the rest of the elements are the variables for this stage. However, when displaying this, it seems to display "NaN" instead of the string I have set as the first character. Would anyone know how to fix this? Thanks in advance.

 perm_f = calc_perm(stage_frac, k);
        perm_flow = perm_f*ratio*stage_total;
        global permeates;
        global rejects;
        perm_string = "STAGE " + string(count) + " permeate";
        perm_for_table(2:length(perm_flow)+1) = perm_flow;
        perm_for_table(1) = perm_string;
        perm_for_table = transpose(perm_for_table);
        rej_string = "STAGE " + string(count) + " reject";
        rej_for_table(2:length(rej_flow)+1) = rej_flow;
        rej_for_table(1) = rej_string;
        rej_for_table = transpose(rej_for_table);
        %permeates = [permeates, perm_for_table];
        %rejects = [rejects, rej_for_table];

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Walter Roberson 2023-5-1

rej_flow is not defined in the code, so we do not know its datatype.

I predict that it is a numeric data type.

Edoardo Modestini 2023-5-1

Hi, yes, it is a numeric data type. How would I go about fixing this in that case?

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Answer 1

Walter Roberson 2023-5-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1956179-how-do-i-stop-strings-in-matrices-from-displaying-as-nan-when-using-disp#answer_1227024

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 perm_f = calc_perm(stage_frac, k);
        perm_flow = perm_f*ratio*stage_total;
        global permeates;
        global rejects;
        perm_string = "STAGE " + string(count) + " permeate";
        perm_for_table(2:length(perm_flow)+1) = perm_flow;
        perm_for_table(1) = perm_string;
        perm_for_table = transpose(perm_for_table);
        rej_string = "STAGE " + string(count) + " reject";
        rej_for_table(2:length(rej_flow)+1) = string(rej_flow);
        rej_for_table(1) = rej_string;
        rej_for_table = transpose(rej_for_table);
        %permeates = [permeates, perm_for_table];
        %rejects = [rejects, rej_for_table];