Turning a double into a scalar

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');

Answer 1

[VBBV]

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

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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

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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

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[VBBV]

you can use a for loop to evaluate the function. From the documentation page for function, he array values need to be greater than zero

[VBBV]

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

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[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

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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

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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

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[Daniel Beeson]

Thank you! they both worked

Lifesaver :)

[Daniel Beeson]

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