How can I solve an equation with 4 vectors of unequal length?

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pocklepeter 2021-10-9

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https://ww2.mathworks.cn/matlabcentral/answers/1470446-how-can-i-solve-an-equation-with-4-vectors-of-unequal-length

评论： pocklepeter 2021-10-9

How do I use an equation to show the possible soloutions if I have four variables as arrays of different lengths?

Can I use increments that don't fit nicely into the end value - eg: if I start at 1 and want to get to 8 can I increment in 3's?

%constants
g = 9.80665; 
%variables in the design
mb = 1:0.5:20;              % From 1 to 20 in increments of 0.5
r = 0.01:0.01:0.15;         % From 0.01 to 0.15 in increments of 0.01
omega = 1800:1000:20000;    % From 1,800 to 20,000 in increments of 1,000
omegarad = omega*2*pi/60;   % to change rpm to radians
h = 0.01:0.1:1;             % From 0.01 to 1 in increments of 0.1
mw = 2*mb.*g*h./((r.*omegarad).^2);

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Answer 1

David Hill 2021-10-9

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https://ww2.mathworks.cn/matlabcentral/answers/1470446-how-can-i-solve-an-equation-with-4-vectors-of-unequal-length#answer_805056

编辑：David Hill 2021-10-9

在 MATLAB Online 中打开

Use ndgrid()

g = 9.80665; 
mb = 1:0.5:20;              
r = 0.01:0.01:0.15;        
omega = 1800:1000:20000;    
omegarad = omega*2*pi/60;  
h = 0.01:0.1:1;   
[mb,r,omegarad,h]=ndgrid(mb,r,omegarad,h);
mw = 2*g*mb.*h./((r.*omegarad).^2);%this provides all combinations of the four variables