Turning a double into a scalar

Question

Daniel Beeson 2024-4-19

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https://ww2.mathworks.cn/matlabcentral/answers/2108886-turning-a-double-into-a-scalar

评论： Daniel Beeson 2024-4-19

Hey all, trying to use flowprandtlmeyer to find mach numbers for a range of different prandtl-meyer angles ('nu' as an input), and getting some issues. The error I am getting for this is that: Inputs must be scalars in Prandtl-Meyer angle input mode. Any ideas on how to do this problem??

close all; clear all; clc

gamma = 1.4;

mach = 2.5;

theta_a = 0:.1:30;

p1 = .2;

t1 = 300;

t_0 = 675;

p_0= 3.417;

vm2 = (theta_a + (39.124));

[mach2, nu2, mu2] = flowprandtlmeyer(gamma, vm2, 'nu');

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Answer 1

VBBV 2024-4-19

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2108886-turning-a-double-into-a-scalar#answer_1444091

编辑：VBBV 2024-4-19

在 MATLAB Online 中打开

close all; clear all; clc
gamma = 1.4;
mach = 2.5;
theta_a = 0:.1:30;
p1 = .2;
t1 = 300;
t_0 = 675;
p_0= 3.417;
vm2 = (theta_a + (39.124));
for k = 1:size(theta_a,2)
    [mach2(k), nu2(k), mu2(k)] = flowprandtlmeyer(gamma, vm2(k), 'nu');
end
mach2 
mach2 = 1x301
    2.5000    2.5043    2.5086    2.5129    2.5172    2.5215    2.5258    2.5302    2.5345    2.5389    2.5432    2.5476    2.5519    2.5563    2.5607    2.5651    2.5695    2.5739    2.5783    2.5827    2.5871    2.5915    2.5960    2.6004    2.6049    2.6093    2.6138    2.6183    2.6227    2.6272
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
nu2
nu2 = 1x301
   39.1240   39.2240   39.3240   39.4240   39.5240   39.6240   39.7240   39.8240   39.9240   40.0240   40.1240   40.2240   40.3240   40.4240   40.5240   40.6240   40.7240   40.8240   40.9240   41.0240   41.1240   41.2240   41.3240   41.4240   41.5240   41.6240   41.7240   41.8240   41.9240   42.0240
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
mu2
mu2 = 1x301
   23.5780   23.5352   23.4925   23.4498   23.4073   23.3649   23.3225   23.2803   23.2381   23.1960   23.1540   23.1121   23.0703   23.0286   22.9869   22.9454   22.9039   22.8625   22.8213   22.7800   22.7389   22.6979   22.6569   22.6161   22.5753   22.5346   22.4940   22.4534   22.4130   22.3726
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>

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VBBV 2024-4-19

在 MATLAB Online 中打开

Possiibly if you exclude zero in the array ,and you could use 'mu' input mode for this if you wnat to avoid for loop

close all; clear all; clc
gamma = 1.4;
mach = 2.5;
theta_a = 0.1:.1:30;
p1 = .2;
t1 = 300;
t_0 = 675;
p_0= 3.417;
vm2 = (theta_a + (39.124))
vm2 = 1x300
   39.2240   39.3240   39.4240   39.5240   39.6240   39.7240   39.8240   39.9240   40.0240   40.1240   40.2240   40.3240   40.4240   40.5240   40.6240   40.7240   40.8240   40.9240   41.0240   41.1240   41.2240   41.3240   41.4240   41.5240   41.6240   41.7240   41.8240   41.9240   42.0240   42.1240
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
[mach2, nu2, mu2] = flowprandtlmeyer(gamma, vm2, 'mu');
mach2 
mach2 = 1x300
    1.5814    1.5780    1.5747    1.5713    1.5680    1.5647    1.5614    1.5582    1.5549    1.5517    1.5485    1.5453    1.5422    1.5390    1.5359    1.5328    1.5297    1.5266    1.5235    1.5205    1.5174    1.5144    1.5114    1.5084    1.5055    1.5025    1.4996    1.4967    1.4938    1.4909
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
nu2
nu2 = 1x300
   14.3099   14.2101   14.1109   14.0123   13.9142   13.8167   13.7198   13.6234   13.5275   13.4322   13.3375   13.2433   13.1496   13.0565   12.9639   12.8718   12.7803   12.6893   12.5988   12.5088   12.4194   12.3304   12.2420   12.1541   12.0667   11.9798   11.8934   11.8075   11.7221   11.6372
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
mu2
mu2 = 1x300
   39.2240   39.3240   39.4240   39.5240   39.6240   39.7240   39.8240   39.9240   40.0240   40.1240   40.2240   40.3240   40.4240   40.5240   40.6240   40.7240   40.8240   40.9240   41.0240   41.1240   41.2240   41.3240   41.4240   41.5240   41.6240   41.7240   41.8240   41.9240   42.0240   42.1240
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>

Daniel Beeson 2024-4-19

Thank you! they both worked

Lifesaver :)

Daniel Beeson 2024-4-19

I tried doing your 2nd way with 'nu' as the input instead of 'mu' and it doesn't like that at all

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Turning a double into a scalar

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