[matlab-to-python binding] How to pass a dictionary from matlab to python ? And loop over keys/values in python ?

2019 5 21
1 个回答
更新时间：2019 5 21
1 次查看（30 天）

0 个投票

Hi,
I am using the matlab-to-python binding (python setup.py install in <matlabroot>/extern/engines/python).
How to pass a dictionary from matlab to python ? And loop over keys/values in python ?
In matlab I have a doStuff.m file which looks like:
function dict = doStuff()
k = strings(2, 1);
v = zeros(2, 1);
for i = 1:2
v(i) = i;
k(i) = ['key', num2str(i)];
end
dict = containers.Map(k, v);
end
In python I have a doStuff.py file which looks like:
import matlab.engine
eng = matlab.engine.start_matlab()
dict = eng.doStuff()
for k in dict:
print(k, dict[k])
And finally get error of this kind in python (after matlab ran OK):
$ python doStuff.py
Traceback (most recent call last):
File "doStuff.py", line 5, in <module>
print(k, dict[k])
TypeError: sequence index must be integer, not 'matlab.object'
If this way to go could hit a limitation: is there any workaround ?
FH

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回答（1 个）

Franck HOUSSEN
Franck HOUSSEN 2019-5-21

1 个投票

Found a workaround: convert dict to string, and, pass string from matlab to python. For people who want to know:
$ cat doThing.m
function kv = doThing()
k = strings(2, 1);
v = zeros(2, 1);
for i = 1:2
v(i) = i;
k(i) = ['key', num2str(i)];
end
dict = containers.Map(k, v);
kv = [keys(dict); values(dict)];
kv = sprintf('%s=%.1f ', kv{:});
end
$ cat doThing.py
import matlab.engine
eng = matlab.engine.start_matlab()
kv = eng.doThing()
for token in kv.split():
k = token.split('=')[0]
v = token.split('=')[1]
print(k, v)
$ python doThing.py
key1 1.0
key2 2.0

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