more refactors; add another example

examples/more/03_ci_beta/example.c

@@ -17,6 +17,7 @@ int main()
 
     ci beta_1_2_ci_90 = sampler_get_90_ci(beta_1_2_sampler, 1000000, seed);
     printf("90%% confidence interval of beta(1,2) is [%f, %f]\n", beta_1_2_ci_90.low, beta_1_2_ci_90.high);
+    printf("You can check this in <https://nunosempere.com/blog/2023/03/15/fit-beta/>\n");
 
     free(seed);
 }

examples/more/13_parallelize_min/example.c

@@ -29,7 +29,7 @@ int main()
 
     int n_samples = 1000000, n_threads = 16;
     double* results = malloc(n_samples * sizeof(double));
-    sampler_parallel(sampler_result, results, n_threads, n_samples);
+    sampler_parallel(sample_min_of_1000, results, n_threads, n_samples);
     printf("Mean of the distribution of (taking the min of 1000 samples of a normal(5,2)): %f\n", array_mean(results, n_samples));
     free(results);
 
@@ -57,7 +57,7 @@ int main()
             }
         }
         if(min > result_remainder){
-            min = results_remainder;
+            min = result_remainder;
         }
         free(results_quotient);
         return min;

examples/more/14_check_confidence_interval/example.c

@@ -0,0 +1,21 @@
+#include "../../../squiggle.h"
+#include "../../../squiggle_more.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    // set randomness seed
+    uint64_t* seed = malloc(sizeof(uint64_t));
+    *seed = 1000; // xorshift can't start with a seed of 0
+    
+    int n = 1000000;
+    double* xs = malloc(sizeof(double) * n);
+    for (int i = 0; i < n; i++) {
+        xs[i] = sample_to(10, 100, seed);
+    }
+    ci ci_90 = array_get_90_ci(xs, n);
+    printf("Recovering confidence interval of sample_to(10, 100):\n  low: %f, high: %f\n", ci_90.low, ci_90.high);
+
+    free(seed);
+}

examples/more/makefile

@@ -48,6 +48,8 @@ all:
 	$(CC) $(OPTIMIZED) $(DEBUG) 10_twitter_thread_example/$(SRC)       $(DEPS) -o 10_twitter_thread_example/$(OUTPUT)
 	$(CC) $(OPTIMIZED) $(DEBUG) 11_billion_lognormals_paralell/$(SRC)  $(DEPS) -o 11_billion_lognormals_paralell/$(OUTPUT)
 	$(CC) $(OPTIMIZED) $(DEBUG) 12_time_to_botec_parallel/$(SRC)       $(DEPS) -o 12_time_to_botec_parallel/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) 13_parallelize_min/$(SRC)              $(DEPS) -o 13_parallelize_min/$(OUTPUT)
+	$(CC) $(OPTIMIZED) $(DEBUG) 14_check_confidence_interval/$(SRC)    $(DEPS) -o 14_check_confidence_interval/$(OUTPUT)
 
 format-all:
 	$(FORMATTER) 00_example_template/$(SRC)
@@ -63,6 +65,8 @@ format-all:
 	$(FORMATTER) 10_twitter_thread_example/$(SRC)
 	$(FORMATTER) 11_billion_lognormals_paralell/$(SRC)
 	$(FORMATTER) 12_time_to_botec_parallel/$(SRC)
+	$(FORMATTER) 13_parallelize_min/$(SRC)
+	$(FORMATTER) 14_check_confidence_interval/$(SRC)
 
 run-all:
 	00_example_template/$(OUTPUT)
@@ -78,6 +82,8 @@ run-all:
 	10_twitter_thread_example/$(OUTPUT)
 	11_billion_lognormals_paralell/$(OUTPUT)
 	12_time_to_botec_parallel/$(OUTPUT)
+	13_parallelize_min/$(OUTPUT)
+	14_check_confidence_interval/$(OUTPUT)
 
 ## make one DIR=06_nuclear_recovery
 one: $(DIR)/$(SRC)

scratchpad/makefile

@@ -9,7 +9,7 @@ CC=gcc
 # CC=tcc # <= faster compilation
 
 # Main file
-SRC=scratchpad.c ../squiggle.c
+SRC=scratchpad.c ../squiggle.c ../squiggle_more.c
 OUTPUT=scratchpad
 
 ## Dependencies

scratchpad/scratchpad.c

@@ -1,4 +1,5 @@
 #include "../squiggle.h"
+#include "../squiggle_more.h"
 #include <math.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -9,14 +10,14 @@ int main()
     // set randomness seed
     uint64_t* seed = malloc(sizeof(uint64_t));
     *seed = 1000; // xorshift can't start with a seed of 0
-    /*
-    for (int i = 0; i < 100; i++) {
-        double draw = sample_unit_uniform(seed);
-        printf("%f\n", draw);
     
-    }*/
-    // Test division
-    printf("\n%d\n", 10 % 3);
+    int n = 1000000;
+    double* xs = malloc(sizeof(double) * n);
+    for (int i = 0; i < n; i++) {
+        xs[i] = sample_to(10, 100, seed);
+    }
+    ci ci_90 = array_get_90_ci(xs, n);
+    printf("Recovering confidence interval of sample_to(10, 100):\n  low: %f, high: %f\n", ci_90.low, ci_90.high);
 
     free(seed);
 }

squiggle_more.h

@@ -6,9 +6,12 @@ void sampler_parallel(double (*sampler)(uint64_t* seed), double* results, int n_
 
 /* Get 90% confidence interval */
 typedef struct ci_t {
-    float low;
-    float high;
+    double low;
+    double high;
 } ci;
+ci array_get_ci(ci interval, double* xs, int n);
+ci array_get_90_ci(double xs[], int n);
+ci sampler_get_ci(ci interval, double (*sampler)(uint64_t*), int n, uint64_t* seed);
 ci sampler_get_90_ci(double (*sampler)(uint64_t*), int n, uint64_t* seed);
 
 /* Algebra manipulations */