Excel Data in Matlab

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Maduka 2022-12-18

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评论： Maduka 2022-12-19

I want to replicate this graph of Grashof number at various velocity at different temperature, but I’m having challenge doing this on Matlab, please any assistance

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Answer 1

KSSV 2022-12-18

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https://ww2.mathworks.cn/matlabcentral/answers/1880532-excel-data-in-matlab#answer_1130457

Read about readtable. Using this import data from excel to MATLAB workspace and than use plot.

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Maduka 2022-12-19

Gr = 5:5:25; % vectors are orthogonal, allowing implicit expansion to 2D t = (0.2:0.2:1).'; H = 1; n = 1; N = 5; Pr = 0.72; S = 0.2;

% pull out common terms B = Pr*(N-n);

% pull out term blocks % note that the terms of TB1 begin with an imbalanced (Pr*(N-n)^k, so it's unclear what that means % i'm going to assume that means (Pr*(N-n))^k, not Pr*(N-n)^k TB1 = t.^2/2 ... + B*(t.^4/24 - t.^2/4) ... + B^2*(t.^6/720 - t.^4/48 + 5*t.^2/48)... % 5*t^2/48 + B^3*(t.^8/40320 - t.^6/1440 + 5*t.^4/576 - 61*t.^2/1440) ... + B^4*(t.^10/36288000 - t.^8/80640 + 5*t.^6/17280 - 61*t.^4/17280 + 1385*t.^2/806400) - 1/2 ... + B*5/24 ... - B^2*61/720 ... + B^3*277/8064 ... - B^4*(0.014);

TB2 = t.^4/24 ... % + not + B.(t.^6/720 - t.^4/48) ... + B^2*(t.^8/40320 - t.^6/1440 + 5*t.^4/576)... + B^3*(t.^10/32688000 - t.^8/80640 + 5*t.^6/17280 - 61*t.^4/17280) ... + B^4*(t.^12/479001600 - t.^10/7257600 + 5*t.^8/967680 - 61*t.^6/518400 + 1385*t.^4/967680) - t.^2/4 ... + B*5*t.^2/48 ... - B^2*61*t.^2/1440 ... + B^3*277*t.^2/16128 ... - B^4*(7*t.^2/1000);

TB3 = 1/24 ... + B*(1/720 - 1/48) ... + B^2*(1/40320 - 1/1440 + 5/576) ... + B^3*(1/36288000 - 1/80640 + 5/17280 - 61/17280) ... + B^4*(1/479001600 - 1/7257600 + 5/967680 - 61/518400 + 1385/967680) - 1/4 ... + B*5/48 ... - B^2*61/1440 ... + B^3*277/16128 ... - B^4*7/100;

U = -Gr.*TB1 - (S + H - n)*Gr.*(TB2 - TB3); % elementwise multiply

% plot everything figure contourf(Gr,t,U) colorbar figure; hp = plot(t,U,'-d'); lstr = cell(numel(Gr),1); for k = 1:numel(Gr) lstr{k} = sprintf('Gr = %d',Gr(k)); end legend(hp,lstr,'location','southwest')

Now I’m trying to generate same curved graph with this code

Maduka 2022-12-19