NOT GETTING PLOT , Actually i want a to find out the change in density,temp, pessure with altitude ( standard atmospheric properties). then use the density for other formula. plzz help . standard atmospheric prop. code given by friend,not understand

Question

Sourav singh 2021-3-7

0
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https://ww2.mathworks.cn/matlabcentral/answers/765146-not-getting-plot-actually-i-want-a-to-find-out-the-change-in-density-temp-pessure-with-altitude

回答： Sourav singh 2021-3-7

function [rho,temp,press]=ceiling(h_in,toffset)
if nargin<2
    toffset=0;
end
if nargin<1
    h_in =0;
end
dimVarout=false;
if isa(h_in,'DimVar')
    h_in=h_in/u.m;
    dimVarout=true;
end
if isa(toffset,'dimVa')
    toffset=toffset/u.k;
end
TonTi=1-2.255769564462953e-005*h_in;
press=101325*TonTi.^5.255879734954165;
temp=TonTi*288.15+toffset;
rho=press./temp/287.05287424707439;
if dimVarout
    rho=rho*u.kg/(u.m^3);
    temp=temp*u.k;
    press=press*u.pa;
end
% formula 
    sigma=0.047193;
    V_tip=180;
    W=180;
    Cd_avg=0.01;
    R=2.235;
    A=pi*R.^2;
P_e= 61147.4;
P_req=((W)^(3/2))./sqrt(2.*rho.*A)+(Cd_avg*rho*sigma*A.*(V_tip).^3)./(8) +747.643-(0.3*P_e);
V_c=(P_e-P_req)./W;
hold on;
plot(V_c,h_in,'b--');
xlabel("V_c");
ylabel("h_in");
plot(P_req,h_in,'r--');

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Answer 1

KALYAN ACHARJYA 2021-3-7

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编辑：KALYAN ACHARJYA 2021-3-7

This is a function file, you need to pass the correct specific input values to get the output. Once I tried with a random array vector of the same size for h_in and tooffset, some curve is generated as below.

If you are a beginner in MATLAB, try it out. Here nargin is just checking number input argument enter to the functions. Refer the MATLAB Docs for more detail

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Answer 2

Sourav singh 2021-3-7

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https://ww2.mathworks.cn/matlabcentral/answers/765146-not-getting-plot-actually-i-want-a-to-find-out-the-change-in-density-temp-pessure-with-altitude#answer_641256

在 MATLAB Online 中打开

function [rho,temp,press]=atmos(h_in,toffset)
if nargin<2
    toffset=0;
end
if nargin<1
    h_in =0;
end
dimVarout=false;
if isa(h_in,'DimVar')
    h_in=h_in/u.m;
    dimVarout=true;
end
if isa(toffset,'dimVa')
    toffset=toffset/u.k;
end
TonTi=1-2.255769564462953e-005*h_in;
press=101325*TonTi.^5.255879734954165;
temp=TonTi*288.15+toffset;
rho=press./temp/287.05287424707439;
if dimVarout
    rho=rho*u.kg/(u.m^3);
    temp=temp*u.k;
    press=press*u.pa;
end
% this is the function how should i call it .. i need the value of rho for my further formula 
% this is my further formula how shuld i call the function so i can use rho 
clc
clear
sigma=0.047193;
    V_tip=180;
    W=180;
    Cd_avg=0.01;
    R=2.235;
    k=1.1;
    A=pi*R.^2;
P_e= 61147.4;
P_req=k*((W)^(3/2))./sqrt(2.*rho.*A)+(Cd_avg*rho*sigma*A.*(V_tip).^3)./(8) +747.643-(0.3*P_e);
V_c=(P_e-P_req)./W;